Individual skill

web-oauth

Attack OAuth 2.0 / OIDC / SSO flows for account takeover. Load on "Login with Google/GitHub", /authorize, /callback, redirect_uri, state, code/token params, SAML/OIDC SSO. Signals: OAuth endpoints, redirect_uri handling, missing state, implicit flow, pre-account-linking.

skills/web/web-oauth/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

agent-skills Repository topic
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ai-security Repository topic
application-security Repository topic
blue-team Repository topic
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codex Repository topic
detection-engineering Repository topic
gemini Repository topic
engineering Derived category

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SKILL.mdcore · 2,246 bytes

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# OAuth / OIDC / SSO abuse

## When it applies
The app delegates auth via OAuth/OIDC (social login, enterprise SSO). Flaws here are frequently
full account takeover.

## Why it works
OAuth security depends on strict validation of `redirect_uri`, `state`, `code` binding, and how
identities are linked. Implementations relax one of these — and the token/code that proves
identity leaks to the attacker or an account gets linked to the wrong user.

## Method
1. **redirect_uri validation**: try appended paths, `//evil`, `@`, subdomain/suffix tricks,
   open-redirect on an allowed host (→ `web-open-redirect`) to exfiltrate the `code`/`token`.