yaklang/hack-skills/saml-sso-assertion-attacks
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SAML SSO assertion attack playbook. Use when testing signature validation, assertion wrapping, audience restrictions, ACS handling, XML trust boundaries, and enterprise SSO flaws.
Install
npx vskill@latest install yaklang/hack-skills/saml-sso-assertion-attacksSKILL.md
SKILL: SAML SSO and Assertion Attacks — Signature Validation, Binding, and Trust Confusion
AI LOAD INSTRUCTION: Use this skill when the target uses SAML-based SSO and you need to validate assertion trust: signature coverage, audience and recipient checks, ACS handling, XML parsing weaknesses, and IdP/SP confusion.
1. WHEN TO LOAD THIS SKILL
Load when:
- Enterprise SSO uses SAML requests or responses
- You see
SAMLRequest,SAMLResponse, XML assertions, or ACS endpoints - Login flows involve an external IdP and browser POST/redirect binding
2. HIGH-VALUE MISCONFIGURATION CHECKS
| Theme | What to Check | |
|---|---|---|
| signature validation | unsigned assertion accepted, wrong node signed, signature wrapping | |
| audience and recipient | weak Audience, Recipient, Destination, or ACS validation | |
| issuer trust | wrong IdP accepted or multi-tenant issuer confusion | |
| replay and freshness | missing InResponseTo, weak NotBefore / NotOnOrAfter enforcement | |
| account mapping | email-only binding, case folding, unverified attributes | |
| XML parser behavior | XXE-like parser issues or unsafe transforms around SAML documents |
3. QUICK TRIAGE
- Capture one full login round trip.
- Inspect which XML nodes are signed and which attributes drive account binding.
- Compare SP-initiated and IdP-initiated flows.
- Test replay, altered attributes, and assertion placement confusion.
4. RELATED ROUTES
- XML parser attack depth: xxe xml external entity
- OAuth or OIDC SSO alternatives: oauth oidc misconfiguration
- Auth boundary issues after SSO: authbypass authentication flaws
Security
- Security scanPassed, 95 of 100Pattern checks on the skill's files.
- Model reviewPassed
Quality evaluation
- Task evaluationNot runNo evaluation yet. Run one in Skill Studio.
Source
- SKILL.md in the repositoryCheckingskills/saml-sso-assertion-attacks/SKILL.md
Popularity
- Installs
- 1
- Repository stars
- 348
- Repository forks
- 62
- 7-day trend score
- 31
Installs come from the vskill CLI. Stars and forks are for the whole GitHub repository, not this skill alone. Refreshed 28 Apr 2026, 5 months ago.
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