Individual skill
testing-api-authentication-weaknesses
Tests API authentication mechanisms for weaknesses including broken token validation, missing authentication on endpoints, weak password policies, credential stuffing susceptibility, token leakage in URLs or logs, and session management flaws. The tester evaluates JWT implementation, API key handling, OAuth flows, and session token entropy to identify authentication bypasses. Maps to OWASP API2:2023 Broken Authentication. Activates for requests involving API authentication testing, token validation assessment, credential security testing, or API auth bypass.
skills/testing-api-authentication-weaknesses/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
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- Last checked
- Nov 2, 2026
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- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- api-security Declared skill tag
- owasp Declared skill tag
- authentication Declared skill tag
- jwt Declared skill tag
- session-management Declared skill tag
- credential-security Declared skill tag
- security Derived category
- testing Derived category
- security-application Derived category
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Read excerpt
# Testing API Authentication Weaknesses
## When to Use
- Assessing REST API authentication mechanisms for bypass vulnerabilities before production deployment
- Testing JWT token implementation for common weaknesses (none algorithm, key confusion, missing expiration)
- Evaluating whether all API endpoints enforce authentication or if some are unintentionally exposed
- Testing API key generation, storage, and rotation mechanisms for predictability or leakage
- Validating session management including token expiration, revocation, and refresh token security
**Do not use** without written authorization. Authentication testing involves attempting to bypass security controls.
## Prerequisites
- Written authorization specifying target API and authentication mechanisms in scope