CVE-2026-57175: social-auth-core has an Improper Authentication issue
The SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued AuthnRequest.
Applications using SAML account association could allow an attacker with a valid account on a trusted IdP to link the attacker’s SAML identity to a logged-in victim’s local account. The attacker could then authenticate through SAML and gain access to the victim’s account.
The issue affects applications using the SAML backend together with authenticated account association.
References
- github.com/advisories/GHSA-vq6g-g6c7-5f2j
- github.com/python-social-auth/social-core/commit/5c72f71125bc60e4411f09e2a9f998de5da7fcb6
- github.com/python-social-auth/social-core/pull/1794
- github.com/python-social-auth/social-core/releases/tag/5.0.0
- github.com/python-social-auth/social-core/security/advisories/GHSA-vq6g-g6c7-5f2j
- nvd.nist.gov/vuln/detail/CVE-2026-57175
Code Behaviors & Features
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