{"id":"CVE-2026-57178","revision":null,"records":[{"revision":"2f72403d0ee14eb5845b77ba76303034","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-57178","aliases":[],"title":"social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing","description":"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.","state":0,"publishedAt":"2026-09-24T17:25:47.225+00:00","modifiedAt":"2026-09-28T17:34:38.454+00:00","affected":[{"ecosystem":"Vendor product","name":"social-core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"python-social-auth\",\n                    \"product\": \"social-core\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.0.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":"HIGH"}],"references":["https://github.com/python-social-auth/social-core/security/advisories/GHSA-3c93-f73f-qc9h"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57178","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-57178","identifiers":["CVE-2026-57178"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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