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 SecurityTalent/bugskill-ai --skill authz-bypassgit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWrote 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/securitytalent/bugskill-ai/authz-bypass)<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/authz-bypass"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/authz-bypass/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/securitytalent/bugskill-ai/authz-bypass"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/authz-bypass.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 | $0.00110 | $0.02251 |
| Opus 5.5 | $0.00044 | $0.00900 |
| Sonnet 5.5 | $0.00022 | $0.00450 |
| Haiku 4.5 | $0.00011 | $0.00225 |
Grade A, and why
authz-bypass scanned grade A with 1 finding 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 20d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s "https://TARGET/invoice?id=12345" \ This is a copy
100% identical to authz-bypass — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authorization Bypass and IDOR
What Is Broken and Why
Access control failures occur when applications enforce authorization only at the UI layer, rely
on obscurity of object identifiers, or fail to validate that the requesting session owns the
referenced resource. Horizontal bypass allows users to access peer accounts' data by swapping
identifiers. Vertical bypass allows low-privileged users to invoke admin-only operations by
replaying high-privilege request structures with a low-privilege session. IDOR (Insecure Direct
Object Reference) exposes any predictable or discoverable resource identifier as a direct handle
to unauthorized data. Special request headers (X-Original-URL, X-Rewrite-URL) can override
routing in some reverse proxy configurations, bypassing ACL rules applied at the path level.
Key Signals
- Numeric or sequential IDs in URLs or parameters:
invoice=12345,user=100,EventID=1000001 - Different accounts created at similar times with adjacent IDs
- Responses containing another user's PII, financial data, or account settings when ID swapped
- Admin-only actions (delete, promote, deactivate) accessible via session swap
X-Original-URLorX-Rewrite-URLheaders triggering 404 vs 403 — confirms header processingX-Forwarded-For: 127.0.0.1bypassing IP-based access restrictions to admin panels- GUIDs or opaque tokens that, when substituted, return another user's object
menuitem=oraccessPage=parameters accepting values outside a user's visible menu set- Password change endpoint accepting
user=parameter without session-ownership validation
Methodology
- Map object references: During application use, record every parameter that references a resource (document ID, user ID, order number, file name, menu item).
- Create test accounts: Register at least two accounts at different privilege levels; note all object IDs each account owns.
- Horizontal bypass: With Account B's session, request objects owned by Account A by substituting Account A's IDs.
- Vertical bypass: With low-privilege session, replay admin-only requests (delete, role change, config update) captured from an admin session.
- IDOR enumeration: Increment/decrement integer IDs; test adjacent values; attempt GUID prediction if UUIDs appear time-seeded.
- Header injection test: Send
X-Original-URL: /adminandX-Rewrite-URL: /adminon a request to/; 404 response (vs 403 on direct access) confirms header support. - IP spoofing header test: Send
X-Forwarded-For: 127.0.0.1on requests to IP-restricted admin endpoints; observe access control difference. - POST-to-GET conversion: Test if server accepts session ID or IDOR parameter via GET when originally designed for POST.
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.
- 20d ago First seen · 181 lines · 110 tokens per session scan A 74a278902e1b
authz-bypass is a skill published in the GitHub repository SecurityTalent/bugskill-ai (13 stars, last pushed 21d ago), licensed MIT. It adds 110 tokens to every session and 2,251 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to authz-bypass, differing in 0 lines, and is treated as a copy.
Other skills, from other repositories
user-research-cookiy
End-to-end user research assistant — qualitative and quantitative. Use this skill whenever the user mentions user research, user interviews, discussion guides, interview guides, research plans, qualitative research, quantitative research, user surveys, survey design, usability studies, participant recruitment…
email-marketing-bible
Email marketing operating manual for AI agents, with hard send-safety gates. Use when someone plans, writes, designs, audits or sends an email campaign, newsletter, welcome series, abandoned-cart, post-purchase or win-back flow; builds a list or segment; drives Klaviyo, Mailchimp, Brevo, Kit or any ESP through MCP, an…
globalpercent
GlobalPercent — build a global-macro-probability panel for an investment research system. Merges public probability data from prediction markets (Polymarket + Kalshi), classifies every market into macro modules (monetary policy / macro economy / AI / etc.), and shows the whole market's expected-probability state at a…
ui-ux-design-pro
Senior-level UI/UX design expert for building data-driven, premium production interfaces. Use when you need to: 1. Design complex applications (dashboards, SaaS, AI tools) from scratch 2. Generate comprehensive design systems (tokens, palettes, typography) 3. Audit existing UI for quality, accessibility, and "craft"…
playwright-best-practices
Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions…
open-map-stack
Use textual agent instructions for GIS and geospatial work: source discovery and provenance, vector/raster/point-cloud pipelines, CRS and metric analysis, spatial SQL, routing and isochrones, QGIS projects, tile generation, and web maps. Use advanced tools and formats such as OSM, Overture, STAC, Sentinel/Landsat…