Individual skill

web-saml

Attack SAML SSO — signature exclusion/wrapping (XSW), unsigned assertions, and comment/XXE tricks to forge authentication. Load on SAML SSO (SAMLResponse, ACS URL, IdP/SP), enterprise login, or "SAML". Signals: SAMLResponse base64 in POST, /saml/acs, <saml:Assertion>, Shibboleth/ADFS/Okta SSO.

skills/web/web-saml/SKILL.md

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Observed behavior: Instructions only
Last checked: Nov 11, 2026

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

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security Derived category

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# SAML authentication attacks

## When it applies
The app authenticates via SAML SSO — the browser POSTs a base64 `SAMLResponse` (an XML assertion
signed by the IdP) to the SP's ACS endpoint. Break the signature validation and you forge login as anyone.

## Why it works
SAML security rests entirely on the SP correctly validating the XML signature over the assertion.
XML signature validation is notoriously error-prone: SPs accept unsigned assertions, validate the
wrong element, or can be tricked by **XML Signature Wrapping (XSW)** — where a signed element is
kept for validation but an injected unsigned assertion is what the app actually reads.

## Method
1. **Capture & decode** the `SAMLResponse` (Burp + **SAML Raider** extension). Identify what's