jwt
JSON Web Token attacks — algorithm confusion (alg=none, HS256↔RS256), kid header injection, JWKS spoofing, weak HMAC secret cracking, signature stripping.
65
78%
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Critical
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tessl review fix ./packages/decepticon/decepticon/skills/standard/exploit/web/jwt/SKILL.mdSecurity
2 findings: 2 critical severity. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E005: Suspicious download URL detected in skill instructions.
What this means
Detected a suspicious URL in the skill instructions that could lead the agent to download and execute malicious scripts or binaries. This includes links to executables from untrusted sources, typosquatting of official packages, URL shorteners that obscure the destination, and personal file hosting services.
Why it was flagged
Multiple URLs point to attacker-controlled hosts and URL-obfuscation patterns (subdomain confusion and userinfo) that are high-risk vectors for delivering malicious jwks.json used in JWT attacks.
E006: Malicious code pattern detected in skill scripts.
What this means
Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.
Why it was flagged
This document is explicitly actionable offensive guidance for forging and abusing JWTs (alg=none, alg confusion, kid/jku injection, signature stripping, offline HMAC cracking, SQLi) enabling unauthorized access and credential theft.
- Repository
- PurpleAILAB/Decepticon
- Commit
0cf691e
- Audited
- Security analysis
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