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 sanjaysaini1952/BugBounty-Arsenal --skill jwt-oauthgit clone --depth 1 https://github.com/sanjaysaini1952/BugBounty-ArsenalWrote 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/sanjaysaini1952/bugbounty-arsenal/jwt-oauth)<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/jwt-oauth"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/jwt-oauth/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/sanjaysaini1952/bugbounty-arsenal/jwt-oauth"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/jwt-oauth.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 | $0.00000 | $0.00750 |
| Opus 5 | $0.00000 | $0.00375 |
| Sonnet 5 | $0.00000 | $0.00150 |
| Haiku 4.5 | $0.00000 | $0.00075 |
Grade A, and why
jwt-oauth scanned grade A with 0 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JWT / OAuth Security Testing Skill — 8+8 Test Cases
Load when: JWT, OAuth, SSO, token security, authentication.
172. JWT alg:none attack (easy)
Decode JWT, change "alg": "RS256" to "alg": "none", remove signature. Submit token. Report if accepted.
173. JWT key confusion (medium)
If app uses RS256, sign token with HMAC using public key. Report if accepted.
174. JWT secret brute force (medium)
If JWT uses HS256 with weak secret, brute force with common passwords. Use jwt_tool.
175. JWT expired token acceptance (easy)
Use expired JWT token. Report if expiration is validated.
176. JWT claim manipulation (medium)
Modify sub, role, isAdmin, exp claims in JWT. Report if modifications are accepted.
177. JWT kid injection (medium)
If JWT has "kid" parameter, inject: {"kid": "/dev/null"} or {"kid": "../../dev/null"}. Report path traversal in key lookup.
178. JWT jwk/jku confusion (hard)
If app validates JWT via embedded JWK or JWKS URL, inject attacker's public key or URL.
179. JWT none algorithm + key confusion combined (hard)
Combine alg:none bypass with claim manipulation for full auth bypass.
180. OAuth redirect_uri open redirect (hard)
If OAuth validates redirect_uri loosely, test subdomain tricks, path traversal, URL parser confusion.
181. OAuth state parameter missing (medium)
Remove state parameter from OAuth flow. Report CSRF vulnerability.
182. OAuth token leakage via referrer (medium)
Check if OAuth tokens appear in URLs that get sent via Referer header.
183. OAuth token leakage via logs (medium)
Check if access tokens appear in server logs, CDN logs, analytics.
184. OAuth scope escalation (medium)
Request elevated scopes beyond what app needs. Report if excessive scopes are granted.
185. OAuth token replay (medium)
Use OAuth refresh token after it should be invalidated (password change, logout).
186. OAuth PKCE bypass (hard)
If app uses PKCE, test if code_verifier check is enforced or can be bypassed.
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 · 79 lines · 0 tokens per session scan A 7e651bf39da6
jwt-oauth is a skill published in the GitHub repository sanjaysaini1952/BugBounty-Arsenal (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 750 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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