saml-sso-assertion-attacks
SAML SSO assertion attack playbook. Use when testing signature validation, assertion wrapping, audience restrictions, ACS handling, XML trust boundaries, and enterprise SSO flaws.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/yaklang/hack-skills --skill saml-sso-assertion-attacks- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads saml-sso-assertion-attacks automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
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
FAQ
What does the saml-sso-assertion-attacks skill do?
SAML SSO assertion attack playbook. Use when testing signature validation, assertion wrapping, audience restrictions, ACS handling, XML trust boundaries, and enterprise SSO flaws.
How do I install saml-sso-assertion-attacks?
Run npx skills add https://github.com/yaklang/hack-skills --skill saml-sso-assertion-attacks in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/saml-sso-assertion-attacks/ (personal) or .claude/skills/saml-sso-assertion-attacks/ (project).
Which AI agents can use saml-sso-assertion-attacks?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is saml-sso-assertion-attacks safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains saml-sso-assertion-attacks?
It is published by yaklang in yaklang/hack-skills. It has 3,597 recorded installs.
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