JWT Vulnerability Detection

by utkusen

JWT Vulnerability Detection is a Quality skill for Claude Code, published by utkusen in sast-skills.

1.3K stars61 forkson utkusen/sast-skillsAdded 2026/07/20Repository updated 2026/04/08

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ai-securityclaudeclaude-codesast

Install in seconds

Install JWT Vulnerability Detection

Copy JWT Vulnerability Detection into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/utkusen/sast-skills/tree/main/sast-files/.claude/skills/sast-jwt ~/.claude/skills/sast-jwt

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/utkusen/sast-skills.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: sast-files/.claude/skills/sast-jwt/SKILL.md in utkusen/sast-skills
Installs to: ~/.claude/skills/sast-jwt
Collection: One of 17 skills cataloged from this repository
Category: Quality — 1897 skills

What JWT Vulnerability Detection does

Detects insecure JWT implementations in codebases. Uses a two-phase approach: mapping JWT issuance/verification sites, then checking for weaknesses such as algorithm confusion, missing signature verification, weak secrets, and missing claim validation. Ideal for finding token forgery or authentication bypass bugs.

JWT Vulnerability Detection is cataloged under Quality on DirSkills. JWT Vulnerability Detection comes from a repository tagged ai-security, claude, claude-code and sast.

Documentation

README

Excerpt

JWT Vulnerability Detection

You are performing a focused security assessment to find insecure JSON Web Token (JWT) implementations. This skill uses a two-phase approach with subagents: recon (map the full JWT lifecycle — issuance, verification, and configuration) then analysis (identify every exploitable weakness in those verification sites).

Prerequisites: sast/architecture.md must exist. Run the analysis skill first if it doesn't.

What is an Insecure JWT Implementation

This is the opening of the README. Read the full README on GitHub.

Frequently asked about JWT Vulnerability Detection

What else does utkusen publish alongside JWT Vulnerability Detection?
JWT Vulnerability Detection is one of 17 skills that DirSkills catalogs from utkusen/sast-skills, the repository it ships in. Its siblings there include Business Logic Vulnerability Detection, Cross-Site Scripting Detection and GraphQL Injection Detection. Each one is a separate skill with its own page in this directory, installs the same way JWT Vulnerability Detection does, and is maintained by utkusen in that same repository. The rest of the collection is listed on the utkusen/sast-skills page.
How does JWT Vulnerability Detection compare to other Quality skills?
JWT Vulnerability Detection ranks #716 by stars among the 1897 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of JWT Vulnerability Detection against them. Open each page to compare what they document and how they install.