{"id":"GHSA-vq6g-g6c7-5f2j","summary":"social-auth-core has an Improper Authentication issue","details":"### Impact\n\nThe SAML backend accepted SAML responses on the Assertion Consumer Service endpoint without verifying that they matched a previously issued `AuthnRequest`.\n\nApplications 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.\n\nThe issue affects applications using the SAML backend together with authenticated account association.\n\n### Patches\n\nThe issue has been fixed by validating SAML responses against stored `AuthnRequest` IDs.\n\nUsers should upgrade to a patched version.\n\nFix:\n\n* https://github.com/python-social-auth/social-core/pull/1794\n\n### Workarounds\n\nApplications that cannot upgrade immediately should disable SAML account association for already authenticated users.\n\nIf SAML login is not required, the SAML backend can also be disabled by removing it from `SOCIAL_AUTH_AUTHENTICATION_BACKENDS`.\n\nThere is no complete workaround while continuing to allow vulnerable SAML account association.\n\n### Credits\n\nReported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice, and Chenchen Yu from the University of Sydney security research team.\n\nReporter references:\n\n* https://lzhou1110.github.io/\n* https://zyy0530.github.io/\n* https://str1ckl4nd.github.io/\n* https://maurice.busystar.org/\n* https://7thparkk.github.io/","aliases":["CVE-2026-57175","PYSEC-2026-4167"],"modified":"2026-10-01T17:55:31.776715671Z","published":"2026-09-24T19:54:48Z","database_specific":{"nvd_published_at":"2026-09-24T18:17:14Z","cwe_ids":["CWE-287"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-09-24T19:54:48Z"},"references":[{"type":"WEB","url":"https://github.com/python-social-auth/social-core/security/advisories/GHSA-vq6g-g6c7-5f2j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57175"},{"type":"WEB","url":"https://github.com/python-social-auth/social-core/pull/1794"},{"type":"WEB","url":"https://github.com/python-social-auth/social-core/commit/5c72f71125bc60e4411f09e2a9f998de5da7fcb6"},{"type":"PACKAGE","url":"https://github.com/python-social-auth/social-core"},{"type":"WEB","url":"https://github.com/python-social-auth/social-core/releases/tag/5.0.0"}],"affected":[{"package":{"name":"social-auth-core","ecosystem":"PyPI","purl":"pkg:pypi/social-auth-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.0"}]}],"versions":["0.0.1","0.1.0","0.2.0","0.2.1","1.0.0","1.0.1","1.1.0","1.2.0","1.3.0","1.4.0","1.5.0","1.6.0","1.7.0","2.0.0","3.0.0","3.1.0","3.2.0","3.3.0","3.3.1","3.3.2","3.3.3","3.4.0","4.0.2","4.0.3","4.1.0","4.2.0","4.3.0","4.4.0","4.4.1","4.4.2","4.5.0","4.5.1","4.5.2","4.5.3","4.5.4","4.5.5","4.5.6","4.6.0","4.6.1","4.7.0","4.8.0","4.8.1","4.8.2","4.8.3","4.8.4","4.8.5","4.8.6","4.8.7","4.9.0","4.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-vq6g-g6c7-5f2j/GHSA-vq6g-g6c7-5f2j.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"}]}