Skip to content
TrustedSkillsbeta
Back to all skills

Jwt Security Testing

Listed
zebbern·vlatest·security

Helps with JWT, security, testing as part of implementing security and authentication workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

Installs under a different name. Its SKILL.md names it JWT Security Testing, not the name it is listed under, so the command below uses that name.
  1. 1

    Run this in your project

    terminal
    $ npx skills add zebbern/secops-cli-guides --skill "JWT Security Testing" -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

zebbern

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill failed 1 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 1 host that is neither well-known infrastructure nor declared in the skill's frontmatter: target.com.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

    Hosts contacted

    target.comundeclared

    What it found

    • skills/jwt-security-testing/SKILL.md:218contacts target.com
      curl -s http://target.com/.well-known/jwks.json

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned zebbern/secops-cli-guides at f8a9ac70c9.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
f8a9ac70c9
Manifest
skills/jwt-security-testing/SKILL.md
Scanned
1 file, 488 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill allows you to test JSON Web Token (JWT) configurations for common security vulnerabilities. It can analyze JWT headers, claims, and signatures to identify potential weaknesses such as weak algorithms, exposed secrets, or exploitable claim structures. The tool helps ensure that your applications are properly securing data transmitted using JWTs.

When to use it

  • Auditing API Security: Evaluate the JWT implementation of an existing API for vulnerabilities before deployment or during security reviews.
  • Testing New Implementations: Verify the correctness and security posture of a newly developed application utilizing JWT authentication.
  • Identifying Configuration Errors: Quickly check if JWT configurations adhere to best practices and avoid common pitfalls.
  • Penetration Testing: Incorporate JWT testing as part of a broader penetration test engagement.

Key capabilities

  • JWT Header Analysis
  • Claim Validation
  • Signature Verification (limited)
  • Algorithm Identification

Example prompts

  • "Analyze this JWT: [paste JWT here]"
  • "Check the header and claims of this token for vulnerabilities."
  • "What algorithm is being used to sign this JWT?"

Tips & gotchas

The skill's signature verification capabilities are limited. It’s best suited for identifying configuration errors rather than complex cryptographic attacks. Ensure you have a valid public key (if applicable) available for analysis if the tool requires it.