{"id":"CVE-2026-89022","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89022","summary":"BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating…","details":"BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at one enabled social provider using a user ID that matches an account linked to a different social provider, bypassing credential verification entirely because the SocialAuthService::handleLoginCallback query ignores the driver column when retrieving linked account records.","published":"2026-09-15T17:17:33.360","modified":"2026-09-15T17:17:33.360","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://www.bookstackapp.com/blog/bookstack-release-v26-05-5/"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/bookstack-authentication-bypass-via-social-login-provider-confusion"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T17:17:33.360"}}