{"schema":"threatline.record/2","record":{"id":"CVE-2026-57179","aliases":["GHSA-vqg6-3fw6-j9jg","PYSEC-2026-4168"],"summary":"social-auth-core has a Session Fixation issue","details":"### Impact\n\nThe partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it.\n\nApplications using resumable partial pipeline steps could allow an attacker to start an authentication flow, obtain a valid partial token and verification data, and cause a victim's browser to resume that attacker-controlled flow. This could authenticate the victim's browser as the attacker's account.\n\nThe issue affects applications using partial pipeline steps such as `mail_validation` or custom steps decorated with `@partial`.\n\n### Patches\n\nThe issue has been fixed by binding partial pipeline resumes to the originating browser session.\n\nUsers should upgrade to a patched version.\n\nFix:\n\n* https://github.com/python-social-auth/social-core/pull/1816\n* https://github.com/python-social-auth/social-docs/pull/444\n* https://github.com/python-social-auth/social-app-django/pull/1009\n\n### Workarounds\n\nApplications that cannot upgrade immediately should disable resumable partial pipeline steps, including `mail_validation` and custom steps decorated with `@partial`.\n\nIf those flows are required, applications should avoid accepting partial resume links from untrusted contexts until a patched version can be deployed.\n\nThere is no complete workaround while continuing to use the vulnerable partial-pipeline resume mechanism.\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/","categories":["Runtimes & languages"],"product":"social-auth-core","vendor":"python-social-auth","ecosystem":"pip","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-vqg6-3fw6-j9jg","source_modified_at":"2026-09-24T19:58:15Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"social-auth-core"},"range":"< 5.0.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-57179","source_modified_at":"2026-09-24T18:11:46.002Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"social-core","vendor":"python-social-auth","versions":[{"version":"< 5.0.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-vqg6-3fw6-j9jg","source_modified_at":"2026-10-01T17:56:15.854049785Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"social-auth-core","purl":"pkg:pypi/social-auth-core"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"5.0.0"}],"type":"ECOSYSTEM"}],"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"]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-vqg6-3fw6-j9jg","source_modified_at":"2026-09-24T19:58:15Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"social-auth-core"},"version":"5.0.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-vqg6-3fw6-j9jg","source_modified_at":"2026-10-01T17:56:15.854049785Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"social-auth-core","purl":"pkg:pypi/social-auth-core"},"version":"5.0.0"}],"cvss":4.2,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00158,"percentile":0.04564,"score_date":"2026-10-23"},"published_at":"2026-09-24T17:27:00.152Z","modified_at":"2026-10-01T17:56:15.854049785Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-vqg6-3fw6-j9jg","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-09-24T19:58:15Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-57179","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-09-24T18:11:46.002Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-vqg6-3fw6-j9jg","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-01T17:56:15.854049785Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-57179","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/python-social-auth/social-core/security/advisories/GHSA-vqg6-3fw6-j9jg","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57179","source":"GitHub Advisory Database"},{"url":"https://github.com/python-social-auth/social-core/pull/1816","source":"GitHub Advisory Database"},{"url":"https://github.com/python-social-auth/social-core/commit/0418782454ac7bbc6a9230ea21f7f5066fe89686","source":"GitHub Advisory Database"},{"url":"https://github.com/python-social-auth/social-core/releases/tag/5.0.0","source":"GitHub Advisory Database"},{"url":"https://github.com/advisories/GHSA-vqg6-3fw6-j9jg","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-24T18:10:50.898479Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-01T17:56:15.854049785Z","content_hash":"10c341c135003c9aa3660ce0f9b721ebddabc9c136420fc09a840f6deb65b37f"}}