SkillCheatSheet
exploiting-jwt-algorithm-confusion-attack
An AI agent skill from mukul975/Anthropic-Cybersecurity-Skills, scored 63 out of 100 by code.
Code score by group
It loses the most points in Done criteria (11), the group that checks whether there is a checklist and a step that verifies the work.
What the author says it does
Exploits JWT algorithm confusion where the server's verification library trusts the alg named in the token header, by switching RS256 to HS256 (signing with the RSA public key as HMAC secret), setting alg to none, or injecting kid/jku/x5u headers to supply an attacker-controlled key. Use when testing RS256 JWT auth for algorithm downgrade, alg:none bypass, or key-confusion signature forgery.
This is the description in the skill's own SKILL.md, written by its author, not by SkillCheatSheet.
- Repository
- mukul975/Anthropic-Cybersecurity-Skills
- Folder
- skills/exploiting-jwt-algorithm-confusion-attack
- License
- Apache-2.0
- GitHub stars
- 35,958
- SKILL.md lines
- 470
- Other files
- 3
Add exploiting-jwt-algorithm-confusion-attack to your agent
npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-jwt-algorithm-confusion-attackThe command uses the open skills CLI. A skill is instructions and scripts your agent will follow, so read it first: open the folder on GitHub at the commit that was scored.
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All skills in mukul975/Anthropic-Cybersecurity-Skills
Scores come from a snapshot of 300 public GitHub repositories taken on 12 November 2026. Every score is the result of fixed checks run by code; no AI is involved. How scoring works.