{"id":"DEBIAN-CVE-2026-57178","details":"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. 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.","modified":"2026-09-26T10:00:08.386096460Z","published":"2026-09-24T18:17:14.970Z","upstream":["CVE-2026-57178"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-57178"}],"affected":[{"package":{"name":"social-auth-core","ecosystem":"Debian:12","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.0-1","4.4.2-1","4.4.2-2","4.5.3-1","4.5.4-1","4.5.6-1","4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1","5.0.2-1","5.1.0-1","5.1.0-2","5.1.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57178.json"}},{"package":{"name":"social-auth-core","ecosystem":"Debian:13","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1","5.0.2-1","5.1.0-1","5.1.0-2","5.1.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57178.json"}},{"package":{"name":"social-auth-core","ecosystem":"Debian:14","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.2-1"}]}],"versions":["4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-57178.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}