Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add scholarly360/owasp-top10-web-skills --skill broken-access-controlgit clone --depth 1 https://github.com/scholarly360/owasp-top10-web-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/scholarly360/owasp-top10-web-skills/broken-access-control)<a href="https://agentmods.dev/skills/scholarly360/owasp-top10-web-skills/broken-access-control"><img src="https://agentmods.dev/badge/skills/scholarly360/owasp-top10-web-skills/broken-access-control/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/scholarly360/owasp-top10-web-skills/broken-access-control"><img src="https://agentmods.dev/badge/skills/scholarly360/owasp-top10-web-skills/broken-access-control.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00146 | $0.02208 |
| Opus 5 | $0.00073 | $0.01104 |
| Sonnet 5 | $0.00029 | $0.00442 |
| Haiku 4.5 | $0.00015 | $0.00221 |
Grade B, and why
broken-access-control scanned grade B with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Cloud metadata endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
**Test vectors:** `http://169.254.169.254/latest/meta-data/` (AWS metadata), `http://localhost:6379` (Redis), `http://10.0.0.1/admin` Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
from urllib.parse import urlparse How it starts
The opening of the file, as written. The whole thing — 255 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Broken Access Control (A01:2025)
The #1 OWASP risk for two consecutive cycles. Found in 3.74% of applications with over 1.8 million occurrences and 32,654 CVEs. Access control enforces that users cannot act outside their intended permissions. Failures lead to unauthorized data disclosure, modification, or destruction.
For deep reference on all CWEs and remediation patterns, see
references/bac-detail.md.
What This Skill Covers
| Sub-category | Description | Key CWEs |
|---|---|---|
| Missing Authorization | Routes/endpoints with no auth guard | CWE-862, CWE-284 |
| IDOR | Resource ownership not verified | CWE-639, CWE-285 |
| CORS Misconfiguration | Wildcard or overly-permissive origins | CWE-284 |
| SSRF | Outbound requests to internal/private IPs | CWE-918 |
| CSRF | State-changing forms missing token validation | CWE-352 |
| Privilege Escalation | Users accessing higher-privilege roles | CWE-269 |
| JWT/Session Manipulation | Metadata tampering, session fixation | CWE-287 |
Workflow: Auditing a FastAPI or Flask App
Step 1 — Identify All Routes
FastAPI:
# List all routes and their dependencies
for route in app.routes:
print(route.path, route.methods, route.dependencies)
Flask:
# Print all registered endpoints
for rule in app.url_map.iter_rules():
print(rule.endpoint, rule.methods, rule.rule)
Flag any route that:
- Handles POST, PUT, PATCH, DELETE without an auth dependency
- Returns user-specific data (profile, orders, files) without ownership check
- Has no rate limiting on sensitive operations
Step 2 — Check Authorization Guards
FastAPI — look for missing Depends():
# VULNERABLE — no auth check
@app.get("/users/{user_id}/data")
async def get_user_data(user_id: int):
return db.query(UserData).filter_by(owner_id=user_id).all()
# SECURE — requires authenticated user
@app.get("/users/{user_id}/data")
async def get_user_data(user_id: int, current_user: User = Depends(get_current_user)):
if current_user.id != user_id:
raise HTTPException(status_code=403, detail="Forbidden")
return db.query(UserData).filter_by(owner_id=user_id).all()
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 255 lines · 146 tokens per session scan B ae692396c6cd
broken-access-control is a skill published in the GitHub repository scholarly360/owasp-top10-web-skills (22 stars, last pushed 5mo ago), licensed MIT. It adds 146 tokens to every session and 2,208 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it B with 2 findings (cloud metadata endpoint, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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