{"id":"CVE-2026-57178","title":"Python Social Auth is a social authentication/registration mechanism","summary":"Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the `vk-app` backend accepted VK application callback data without verifying the callback signature when the `auth_key` parameter was omitted. …","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-287","CWE-347"],"vendor":"python-social-auth","product":"social-core","affected":["social-core < 5.0.0"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T18:17:14.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-57178","references":[{"url":"https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57178"},{"url":"https://github.com/python-social-auth/social-core/pull/1811"},{"url":"https://github.com/python-social-auth/social-core/commit/1bfacdd0379e5eb46e169a99ab648b835e9bb6a2"},{"url":"https://github.com/python-social-auth/social-core/releases/tag/5.0.0"},{"url":"https://github.com/advisories/GHSA-3c93-f73f-qc9h"},{"url":"https://github.com/python-social-auth/social-core"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57178.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-57178"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540600"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-57178"}],"tags":["nvd","cve.org","ghsa","pip","osv","csaf","vex","red-hat"],"ingestedAt":"2026-09-24T17:48:30.406Z","aliases":["GHSA-3c93-f73f-qc9h"],"ecosystem":"pip","patched":["social-auth-core 5.0.0"],"slug":"CVE-2026-57178","body":"## Overview\n\nPython Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the `vk-app` backend accepted VK application callback data without verifying the callback signature when the `auth_key` parameter was omitted. Applications using this backend could treat unsigned attacker-controlled data as a verified VK identity. An attacker could choose callback fields such as `viewer_id`, `access_token`, `api_id`, and `api_result`, potentially allowing authentication as an arbitrary VK user ID. The issue affects only applications using the `vk-app` backend. The issue has been fixed in version 5.0.0 by requiring `auth_key` to be present and valid before callback data is trusted.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-57178)\n\nAffected packages:\n\n- `social-auth-core < 5.0.0`\n\nPatched in:\n\n- `social-auth-core 5.0.0`\n\nSource: https://github.com/advisories/GHSA-3c93-f73f-qc9h\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Ansible Automation Platform 2 · no fix planned: Red Hat Ansible Automation Platform 2 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57178.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}