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Replay captured requests with swapped identities and bumped object IDs to surface broken access control. Use when testing for IDOR or authz flaws.
Replay captured requests with swapped identities and bumped object IDs to surface broken access control. Use when testing for IDOR or authz flaws.
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Only run against an application the user owns or is contractually engaged to test. This is an ACTIVE, aggressive check: it re-sends real requests to the target under different identities and with mutated object-ids, so it creates traffic, may read or touch other users' data, and can trip rate-limits or alerts. Use a staging environment or a maintenance window where you can, keep the identities and object-ids to accounts you control, and stop if you start returning data that clearly belongs to real third parties. If scope is unclear, ask before replaying.
Two things must exist before you start:
name=value) or a bearer token (Authorization: Bearer ...).This skill covers authorization replay and numeric IDOR on already-captured requests. It does not fuzz for hidden endpoints, mutate non-numeric/UUID object references, or bypass auth at the token layer (JWT tampering, session fixation) - note those as unrun if the target warrants a deeper pass.
Inventory the capture. From the privileged capture, list each request as its parts: method, full URL, headers, query params, cookies, body. These are the units you replay; you never craft new endpoints, only re-send captured ones under new conditions.
Baseline each request as the privileged user. Re-send it exactly as captured and record status_code and response body length. This is the reference every swapped-identity and mutated-id response is compared against, and it confirms the request still works before you draw conclusions from a difference.
Swap identity, replay unchanged (authorization check). For every captured request, replace only the identity - drop in each second identity's cookie or Authorization header in place of the privileged one, leaving method, URL, params, and body identical. Compare each replay's (status_code, length) to the privileged baseline. Report a finding when a lesser or unauthenticated identity returns a success status with a body within 50 bytes of the privileged length (i.e. abs(length_diff) <= 50 and no status change) - the low-priv session is being served the privileged response. The source's own trigger is the inverse framing: it flags a pair as differing when length_diff > 50 or the status differs, so a non-differing successful pair across two different identities is the access-control failure.
Find numeric object-id params. In each captured request's query params, match parameter names against the IDOR wordlist below. Keep only params whose value parses as an integer - these are the candidate direct object references.
Baseline the id param. Re-send the request with its original numeric id (under the identity that legitimately owns that object) and record baseline_status ("<code> <reason>") and baseline_body_len (length of the parsed JSON response). Skip the param if the response is not JSON or the length is zero - there is nothing to compare.
Increment the id, twice (IDOR check). Send the same request twice more, changing only that one param: once at original + 1 (first_attempt_size_increase = 1), once at original + 100 (second_attempt_size_increase = 100). Record status and JSON length for each. Two offsets cover both a densely-packed id space (neighbour exists at +1) and a sparser one (+100 lands on another live object).
Decide IDOR. Report a finding when the +1 attempt returns the same status as the baseline AND either mutated attempt's JSON length differs from the baseline by at least response_body_length_diff = 3. Same success status across a different id means the object still resolves under your identity; a body-length difference of >= 3 means you got a different object's data rather than an empty/error shell. Same status with a near-identical length is the ambiguous "same template, maybe empty" case and is not reported on its own.
Cross the two checks. The strongest finding is a captured request where an id-param increment (steps 4-7) succeeds and the same request replays successfully under a lower-privileged or unauthenticated identity (step 3): an object reference that is both enumerable and unprotected by the session.
Set the target and the privileged identity once. PRIV_COOKIE/PRIV_AUTH come from your privileged capture; LOW_COOKIE/LOW_AUTH are the second identity; empty strings are the unauthenticated case.
BASE="https://TARGET"
PRIV_COOKIE="session=PRIV_SESSION_VALUE"
PRIV_AUTH="Authorization: Bearer PRIV_TOKEN"
LOW_COOKIE="session=LOW_SESSION_VALUE"
LOW_AUTH="Authorization: Bearer LOW_TOKEN"
# 2 baseline a captured request as the privileged user (status + body length)
curl -sk -o /dev/null -w '%{http_code} %{size_download}b\n' \
-H "$PRIV_AUTH" -b "$PRIV_COOKIE" "$BASE/api/report?client_id=1024"
# 3 authorization check: replay the SAME request under each identity, compare
REQ="/api/report?client_id=1024"
for id in "priv:$PRIV_AUTH:$PRIV_COOKIE" "low:$LOW_AUTH:$LOW_COOKIE" "anon:::"; do
name="${id%%:*}"; rest="${id#*:}"; auth="${rest%%:*}"; cook="${rest#*:}"
printf '%-5s ' "$name"
curl -sk -o /dev/null -w '%{http_code} %{size_download}b\n' \
${auth:+-H "$auth"} ${cook:+-b "$cook"} "$BASE$REQ"
done
# finding: a lesser/anon identity returns a success code with size within ~50b of priv
# 4-7 numeric IDOR: replay one captured request three times, mutating one id param
import json, urllib.request, urllib.parse, ssl
ctx = ssl.create_default_context(); ctx.check_hostname = False; ctx.verify_mode = ssl.CERT_NONE
NUMERIC_IDOR_PARAMS = {
"client_id", "clientId", "clientid", "client",
"user_id", "userId", "userid", "user",
"document_id", "documentId", "documentid", "document",
"account", "account_id", "accountId", "accountid",
"project", "project_id", "projectId", "projectid",
"report_id", "reportId", "reportid", "report",
"file_id", "fileId", "fileid", "file",
}
RESPONSE_BODY_LENGTH_DIFF = 3
FIRST_ATTEMPT_SIZE_INCREASE = 1
SECOND_ATTEMPT_SIZE_INCREASE = 100
METHOD = "GET"
URL = "https://TARGET/api/report"
HEADERS = {"Authorization": "Bearer PRIV_TOKEN", "Cookie": "session=PRIV_SESSION_VALUE"}
PARAMS = {"client_id": "1024"}
BODY = None
def send(params):
qs = urllib.parse.urlencode(params)
url = f"{URL}?{qs}" if qs else URL
data = BODY.encode() if isinstance(BODY, str) else BODY
req = urllib.request.Request(url, data=data, method=METHOD, headers=HEADERS)
with urllib.request.urlopen(req, context=ctx) as r:
raw = r.read()
try:
body_len = len(json.loads(raw))
except Exception:
body_len = None
return f"{r.status} {r.reason}", body_len
for key, val in list(PARAMS.items()):
if key not in NUMERIC_IDOR_PARAMS:
continue
try:
base_val = int(val)
except ValueError:
continue
base_status, base_len = send({**PARAMS, key: base_val})
if not base_len:
continue
a1_status, a1_len = send({**PARAMS, key: base_val + FIRST_ATTEMPT_SIZE_INCREASE})
a2_status, a2_len = send({**PARAMS, key: base_val + SECOND_ATTEMPT_SIZE_INCREASE})
same_status = a1_status == base_status
len_moved = (a1_len is not None and abs(base_len - a1_len) >= RESPONSE_BODY_LENGTH_DIFF) or \
(a2_len is not None and abs(base_len - a2_len) >= RESPONSE_BODY_LENGTH_DIFF)
if same_status and len_moved:
print(f"IDOR: parameter {key}={base_val} seems iterable at {URL}")
Match captured query-param names against this set; keep only values that parse as integers. It is the union of the two source checks plus their case/underscore enrichment (each snake_case seed also yields its camelCase, flatcase, and bare-prefix forms):
client_id, clientId, clientid, client
user_id, userId, userid, user
document_id, documentId, documentid, document
account, account_id, accountId, accountid
project, project_id, projectId, projectid
report_id, reportId, reportid, report
file_id, fileId, fileid, file
| Constant | Value | Meaning |
|---|---|---|
| Authorization length tolerance | 50 bytes | Two identities whose responses differ by more than 50 bytes (or in status) are treated as different; a successful pair within 50 bytes is the access-control finding. |
response_body_length_diff | 3 | Minimum JSON-length delta between the baseline object and a mutated-id object to count the id as iterable. |
first_attempt_size_increase | 1 | First id offset (adjacent object). |
second_attempt_size_increase | 100 | Second id offset (sparse id space). |
Finish with a request / check / result ledger over the captured requests you replayed, then a one-line verdict:
Report each captured request's true status - replayed or not-run - so coverage is honest; never present an unrun request as clean.
name: broken-access-control description: Replay captured requests with swapped identities and bumped object IDs to surface broken access control. Use when testing for IDOR or authz flaws.
---
name: broken-access-control
description: Replay captured requests with swapped identities and bumped object IDs to surface broken access control. Use when testing for IDOR or authz flaws.
---
## Contents
- Scope & authorization
- Methodology (baseline, identity-swap, numeric IDOR)
- Runnable snippets
- IDOR numeric-parameter wordlist
- Thresholds (carry these exactly)
- Output
## Scope & authorization
Only run against an application the user owns or is contractually engaged to test. This is an ACTIVE, aggressive check: it re-sends real requests to the target under different identities and with mutated object-ids, so it creates traffic, may read or touch other users' data, and can trip rate-limits or alerts. Use a staging environment or a maintenance window where you can, keep the identities and object-ids to accounts you control, and stop if you start returning data that clearly belongs to real third parties. If scope is unclear, ask before replaying.
Two things must exist before you start:
1. A capture of the target's traffic taken as a **privileged / higher-role user** (from a proxy, HAR export, or your own request log). Each captured request gives you the method, URL, headers, query params, cookies, and body.
2. At least one **second identity** to replay under - a lower-privileged user's session, and/or the unauthenticated (no-token, no-cookie) state. An identity is either a cookie (`name=value`) or a bearer token (`Authorization: Bearer ...`).
This skill covers authorization replay and numeric IDOR on already-captured requests. It does not fuzz for hidden endpoints, mutate non-numeric/UUID object references, or bypass auth at the token layer (JWT tampering, session fixation) - note those as unrun if the target warrants a deeper pass.
## Methodology (run in order; each step is a check with a result state)
1. **Inventory the capture.** From the privileged capture, list each request as its parts: method, full URL, headers, query params, cookies, body. These are the units you replay; you never craft new endpoints, only re-send captured ones under new conditions.
2. **Baseline each request as the privileged user.** Re-send it exactly as captured and record `status_code` and response body length. This is the reference every swapped-identity and mutated-id response is compared against, and it confirms the request still works before you draw conclusions from a difference.
3. **Swap identity, replay unchanged (authorization check).** For every captured request, replace only the identity - drop in each second identity's cookie or `Authorization` header in place of the privileged one, leaving method, URL, params, and body identical. Compare each replay's `(status_code, length)` to the privileged baseline. Report a finding when a lesser or unauthenticated identity returns a **success status with a body within 50 bytes of the privileged length** (i.e. `abs(length_diff) <= 50` and no status change) - the low-priv session is being served the privileged response. The source's own trigger is the inverse framing: it flags a pair as differing when `length_diff > 50` or the status differs, so a *non*-differing successful pair across two different identities is the access-control failure.
4. **Find numeric object-id params.** In each captured request's query params, match parameter names against the IDOR wordlist below. Keep only params whose value parses as an integer - these are the candidate direct object references.
5. **Baseline the id param.** Re-send the request with its original numeric id (under the identity that legitimately owns that object) and record `baseline_status` (`"<code> <reason>"`) and `baseline_body_len` (length of the parsed JSON response). Skip the param if the response is not JSON or the length is zero - there is nothing to compare.
6. **Increment the id, twice (IDOR check).** Send the same request twice more, changing only that one param: once at `original + 1` (`first_attempt_size_increase = 1`), once at `original + 100` (`second_attempt_size_increase = 100`). Record status and JSON length for each. Two offsets cover both a densely-packed id space (neighbour exists at +1) and a sparser one (+100 lands on another live object).
7. **Decide IDOR.** Report a finding when the **+1 attempt returns the same status as the baseline** AND **either mutated attempt's JSON length differs from the baseline by at least `response_body_length_diff = 3`**. Same success status across a different id means the object still resolves under your identity; a body-length difference of >= 3 means you got a *different* object's data rather than an empty/error shell. Same status with a near-identical length is the ambiguous "same template, maybe empty" case and is not reported on its own.
8. **Cross the two checks.** The strongest finding is a captured request where an id-param increment (steps 4-7) succeeds *and* the same request replays successfully under a lower-privileged or unauthenticated identity (step 3): an object reference that is both enumerable and unprotected by the session.
## Runnable snippets
Set the target and the privileged identity once. `PRIV_COOKIE`/`PRIV_AUTH` come from your privileged capture; `LOW_COOKIE`/`LOW_AUTH` are the second identity; empty strings are the unauthenticated case.
```bash
BASE="https://TARGET"
PRIV_COOKIE="session=PRIV_SESSION_VALUE"
PRIV_AUTH="Authorization: Bearer PRIV_TOKEN"
LOW_COOKIE="session=LOW_SESSION_VALUE"
LOW_AUTH="Authorization: Bearer LOW_TOKEN"
```
```bash
# 2 baseline a captured request as the privileged user (status + body length)
curl -sk -o /dev/null -w '%{http_code} %{size_download}b\n' \
-H "$PRIV_AUTH" -b "$PRIV_COOKIE" "$BASE/api/report?client_id=1024"
# 3 authorization check: replay the SAME request under each identity, compare
REQ="/api/report?client_id=1024"
for id in "priv:$PRIV_AUTH:$PRIV_COOKIE" "low:$LOW_AUTH:$LOW_COOKIE" "anon:::"; do
name="${id%%:*}"; rest="${id#*:}"; auth="${rest%%:*}"; cook="${rest#*:}"
printf '%-5s ' "$name"
curl -sk -o /dev/null -w '%{http_code} %{size_download}b\n' \
${auth:+-H "$auth"} ${cook:+-b "$cook"} "$BASE$REQ"
done
# finding: a lesser/anon identity returns a success code with size within ~50b of priv
```
```python
# 4-7 numeric IDOR: replay one captured request three times, mutating one id param
import json, urllib.request, urllib.parse, ssl
ctx = ssl.create_default_context(); ctx.check_hostname = False; ctx.verify_mode = ssl.CERT_NONE
NUMERIC_IDOR_PARAMS = {
"client_id", "clientId", "clientid", "client",
"user_id", "userId", "userid", "user",
"document_id", "documentId", "documentid", "document",
"account", "account_id", "accountId", "accountid",
"project", "project_id", "projectId", "projectid",
"report_id", "reportId", "reportid", "report",
"file_id", "fileId", "fileid", "file",
}
RESPONSE_BODY_LENGTH_DIFF = 3
FIRST_ATTEMPT_SIZE_INCREASE = 1
SECOND_ATTEMPT_SIZE_INCREASE = 100
METHOD = "GET"
URL = "https://TARGET/api/report"
HEADERS = {"Authorization": "Bearer PRIV_TOKEN", "Cookie": "session=PRIV_SESSION_VALUE"}
PARAMS = {"client_id": "1024"}
BODY = None
def send(params):
qs = urllib.parse.urlencode(params)
url = f"{URL}?{qs}" if qs else URL
data = BODY.encode() if isinstance(BODY, str) else BODY
req = urllib.request.Request(url, data=data, method=METHOD, headers=HEADERS)
with urllib.request.urlopen(req, context=ctx) as r:
raw = r.read()
try:
body_len = len(json.loads(raw))
except Exception:
body_len = None
return f"{r.status} {r.reason}", body_len
for key, val in list(PARAMS.items()):
if key not in NUMERIC_IDOR_PARAMS:
continue
try:
base_val = int(val)
except ValueError:
continue
base_status, base_len = send({**PARAMS, key: base_val})
if not base_len:
continue
a1_status, a1_len = send({**PARAMS, key: base_val + FIRST_ATTEMPT_SIZE_INCREASE})
a2_status, a2_len = send({**PARAMS, key: base_val + SECOND_ATTEMPT_SIZE_INCREASE})
same_status = a1_status == base_status
len_moved = (a1_len is not None and abs(base_len - a1_len) >= RESPONSE_BODY_LENGTH_DIFF) or \
(a2_len is not None and abs(base_len - a2_len) >= RESPONSE_BODY_LENGTH_DIFF)
if same_status and len_moved:
print(f"IDOR: parameter {key}={base_val} seems iterable at {URL}")
```
## IDOR numeric-parameter wordlist
Match captured query-param names against this set; keep only values that parse as integers. It is the union of the two source checks plus their case/underscore enrichment (each `snake_case` seed also yields its `camelCase`, `flatcase`, and bare-prefix forms):
```
client_id, clientId, clientid, client
user_id, userId, userid, user
document_id, documentId, documentid, document
account, account_id, accountId, accountid
project, project_id, projectId, projectid
report_id, reportId, reportid, report
file_id, fileId, fileid, file
```
## Thresholds (carry these exactly)
| Constant | Value | Meaning |
|---|---|---|
| Authorization length tolerance | 50 bytes | Two identities whose responses differ by more than 50 bytes (or in status) are treated as *different*; a successful pair within 50 bytes is the access-control finding. |
| `response_body_length_diff` | 3 | Minimum JSON-length delta between the baseline object and a mutated-id object to count the id as iterable. |
| `first_attempt_size_increase` | 1 | First id offset (adjacent object). |
| `second_attempt_size_increase` | 100 | Second id offset (sparse id space). |
## Output
Finish with a `request / check / result` ledger over the captured requests you replayed, then a one-line verdict:
- **Clean** - every captured request re-authorized correctly (lesser/anon identities were rejected or served a materially different response) and no numeric id param proved iterable.
- **Broken access control** - name the failing request, the check that caught it (identity-swap, id-increment, or both), the identity/id that succeeded, and the observed status/length pair versus the privileged baseline. Fix: enforce per-object ownership checks server-side on every request (never trust a client-supplied id or the mere presence of a valid session), and return 403/404 uniformly so length and status do not leak object existence.
Report each captured request's true status - replayed or not-run - so coverage is honest; never present an unrun request as clean.
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
68/100
Promising
Trust
60/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"tier": "unproven",
"label": "Needs first agent run",
"summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
"metrics": {
"totalOutcomes": 0,
"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 75,
"risk_level": "risky",
"risk_label": "Risky",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
"The skill is inherently active and could cause unintended side effects if misused, but it includes strong scope and authorization safeguards.",
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"Stars/forks activity: 144 stars, 30 forks; issue activity unavailable in current metadata"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 68,
"label": "Promising"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "10d since push",
"risk": "Risky"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"The skill is inherently active and could cause unintended side effects if misused, but it includes strong scope and authorization safeguards.",
"No OpenAgentSkill engagement data yet",
"Audit risk risky exceeds max_risk=medium",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing"
],
"agent_contract": {
"task_input": "Use broken-access-control in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 68/100 Manual review",
"Audit: 75/100 Risky",
"Safety: 27/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "forefy-broken-access-control (broken-access-control)",
"install_command": "npx skills add forefy/.context --skill broken-access-control",
"risk_summary": "Risky; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "forefy-broken-access-control",
"task": "Use broken-access-control in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/forefy-broken-access-control",
"api": "https://www.openagentskill.com/api/agent/skills/forefy-broken-access-control",
"audit": "https://www.openagentskill.com/skills/forefy-broken-access-control/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=forefy-broken-access-control&task=Use%20broken-access-control%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20broken-access-control%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20broken-access-control%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/forefy-broken-access-control/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/forefy-broken-access-control"
}
}Listing source
This listing was indexed from public sources and is not marked official until a maintainer claim is approved.
Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals.
Claim this skillOwner claim
This Registry indexed listing is attributed to forefy but is not marked official yet. Claim it to add a verified owner signal and make future launch, install, and audit updates easier to trust.
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Audit
75/100
Risky
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.