skill-yaklang-hack-skills-api-auth-and-jwt-abuse · by Install
$ agentstack add skill-yaklang-hack-skills-api-auth-and-jwt-abuse ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
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Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-yaklang-hack-skills-api-auth-and-jwt-abuse) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
SKILL: API Auth and JWT Abuse — Token Trust, Header Tricks, and Rate Limits
> AI LOAD INSTRUCTION: Use this skill when APIs rely on JWT, bearer tokens, API keys, or weak request identity signals. Focus on token trust boundaries, claim misuse, header spoofing, and rate-limit bypass.
1. TOKEN TRIAGE
Inspect:
alg,kid,jku,x5u- role, org, tenant, scope, or privilege claims
- issuer and audience mismatches
- reuse of mobile and web tokens across products
2. QUICK ATTACK PICKS
| Pattern | First Test | |---|---| | alg:none acceptance | unsigned token with trailing dot | | RS256 confusion | switch to HS256 using public key as secret | | kid lookup trust | path traversal or injection in kid | | remote key fetch trust | attacker-controlled jku or x5u | | weak secret | offline crack with targeted wordlists |
3. HIDDEN FIELDS AND BATCH ABUSE
Mass assignment field picks
role
isAdmin
admin
verified
plan
tier
permissions
org
ownerRate limit and batch abuse picks
X-Forwarded-For: 1.2.3.4
X-Real-IP: 5.6.7.8
Forwarded: for=9.9.9.9GraphQL or JSON batch abuse candidates:
- arrays of login mutations
- bulk object fetches with varying IDs
- repeated password reset or verification calls in one request
4. RATE LIMIT BYPASS FAMILIES
X-Forwarded-For
X-Real-IP
Forwarded
User-Agent rotation
Path case / slash variants5. NEXT ROUTING
- For GraphQL batching and hidden parameters: [graphql and hidden parameters](../graphql-and-hidden-parameters/SKILL.md)
- For default credential and brute-force planning: [authentication bypass](../authbypass-authentication-flaws/SKILL.md)
- For full JWT and OAuth depth: [jwt oauth token attacks](../jwt-oauth-token-attacks/SKILL.md)
- For OAuth or OIDC configuration flaws in browser and SSO flows: [oauth oidc misconfiguration](../oauth-oidc-misconfiguration/SKILL.md)
- For credentialed browser reads and origin trust bugs: [cors cross origin misconfiguration](../cors-cross-origin-misconfiguration/SKILL.md)
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: yaklang
- Source: yaklang/hack-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.