maSSO: A Weaponized Identity Provider for SSO Security Testing

maSSO is an open-source security testing tool from Doyensec that acts as a malicious but standards-compliant OIDC and SAML 2.0 Identity Provider. It enables security testers to intercept, modify, and re-sign authentication messages, claims, and tokens, making it easier to assess trust boundaries, validate authentication logic, and identify vulnerabilities in Single Sign-On implementations that are difficult to test with conventional IdPs. 

https://github.com/doyensec/maSSO

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