{"id":"CVE-2026-110864","summary":"Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy","details":"Better Auth from 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy plugin that allows unauthenticated attackers to sign in as other users by forging encrypted profiles. When the proxy shares the global secret and cookie-stored state is used, attackers can obtain encrypted state for a fake profile with a victim's verified email to take over the account via implicit linking.","aliases":["GHSA-r4xp-prcw-77qf"],"modified":"2026-10-16T02:47:58.316913565Z","published":"2026-10-14T22:52:51.393Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110864.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-287"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110864.json"},{"type":"ADVISORY","url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-r4xp-prcw-77qf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110864"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/better-auth-1.5.0-beta.12-before-1.7.7-authentication-bypass-via-oauth-proxy"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/better-auth/better-auth","events":[{"introduced":"dd6dc4601ff1c5a68f869fb285d3a9bd48074b66"},{"fixed":"db02f233918ad1233bf0753e437e1c0da353273d"}],"database_specific":{"extracted_events":[{"introduced":"1.5.0-beta.12"},{"fixed":"1.7.7"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.6.30","v1.7.1","v1.7.0","v1.6.29","v1.6.28","v1.6.27","v1.6.26","v1.6.25","v1.6.24","v1.6.23","v1.6.22","v1.6.21","v1.6.20","v1.6.19","v1.6.18","v1.6.17","v1.6.16","better-auth@1.6.16","auth@1.6.16","@better-auth/test-utils@1.6.16","@better-auth/telemetry@1.6.16","@better-auth/stripe@1.6.16","@better-auth/sso@1.6.16","@better-auth/scim@1.6.16","@better-auth/redis-storage@1.6.16","@better-auth/prisma-adapter@1.6.16","@better-auth/passkey@1.6.16","@better-auth/oauth-provider@1.6.16","@better-auth/mongo-adapter@1.6.16","@better-auth/memory-adapter@1.6.16","@better-auth/kysely-adapter@1.6.16","@better-auth/i18n@1.6.16","@better-auth/expo@1.6.16","@better-auth/electron@1.6.16","@better-auth/drizzle-adapter@1.6.16","@better-auth/core@1.6.16","@better-auth/api-key@1.6.16","v1.6.15","better-auth@1.6.15","auth@1.6.15","@better-auth/test-utils@1.6.15","@better-auth/telemetry@1.6.15","@better-auth/stripe@1.6.15","@better-auth/sso@1.6.15","@better-auth/scim@1.6.15","@better-auth/redis-storage@1.6.15","@better-auth/prisma-adapter@1.6.15","@better-auth/passkey@1.6.15","@better-auth/oauth-provider@1.6.15","@better-auth/mongo-adapter@1.6.15","@better-auth/memory-adapter@1.6.15","@better-auth/kysely-adapter@1.6.15","@better-auth/i18n@1.6.15","@better-auth/expo@1.6.15","@better-auth/electron@1.6.15","@better-auth/drizzle-adapter@1.6.15","@better-auth/core@1.6.15","@better-auth/api-key@1.6.15","v1.6.14","better-auth@1.6.14","auth@1.6.14","@better-auth/test-utils@1.6.14","@better-auth/telemetry@1.6.14","@better-auth/stripe@1.6.14","@better-auth/sso@1.6.14","@better-auth/scim@1.6.14","@better-auth/redis-storage@1.6.14","@better-auth/prisma-adapter@1.6.14","@better-auth/passkey@1.6.14","@better-auth/oauth-provider@1.6.14","@better-auth/mongo-adapter@1.6.14","@better-auth/memory-adapter@1.6.14","@better-auth/kysely-adapter@1.6.14","@better-auth/i18n@1.6.14","@better-auth/expo@1.6.14","@better-auth/electron@1.6.14","@better-auth/drizzle-adapter@1.6.14","@better-auth/core@1.6.14","@better-auth/api-key@1.6.14","v1.6.13","better-auth@1.6.13","auth@1.6.13","@better-auth/test-utils@1.6.13","@better-auth/telemetry@1.6.13","@better-auth/stripe@1.6.13","@better-auth/sso@1.6.13","@better-auth/scim@1.6.13","@better-auth/redis-storage@1.6.13","@better-auth/prisma-adapter@1.6.13","@better-auth/passkey@1.6.13","@better-auth/oauth-provider@1.6.13","@better-auth/mongo-adapter@1.6.13","@better-auth/memory-adapter@1.6.13","@better-auth/kysely-adapter@1.6.13","@better-auth/i18n@1.6.13","@better-auth/expo@1.6.13","@better-auth/electron@1.6.13","@better-auth/drizzle-adapter@1.6.13","@better-auth/core@1.6.13","@better-auth/api-key@1.6.13","v1.6.12","better-auth@1.6.12","auth@1.6.12","@better-auth/test-utils@1.6.12","@better-auth/telemetry@1.6.12","@better-auth/stripe@1.6.12","@better-auth/sso@1.6.12","@better-auth/scim@1.6.12","@better-auth/redis-storage@1.6.12","@better-auth/prisma-adapter@1.6.12","@better-auth/passkey@1.6.12","@better-auth/oauth-provider@1.6.12","@better-auth/mongo-adapter@1.6.12","@better-auth/memory-adapter@1.6.12","@better-auth/kysely-adapter@1.6.12","@better-auth/i18n@1.6.12","@better-auth/expo@1.6.12","@better-auth/electron@1.6.12","@better-auth/drizzle-adapter@1.6.12","@better-auth/core@1.6.12","@better-auth/api-key@1.6.12","v1.6.11","better-auth@1.6.11","auth@1.6.11","@better-auth/test-utils@1.6.11","@better-auth/telemetry@1.6.11","@better-auth/stripe@1.6.11","@better-auth/sso@1.6.11","@better-auth/scim@1.6.11","@better-auth/redis-storage@1.6.11","@better-auth/prisma-adapter@1.6.11","@better-auth/passkey@1.6.11","@better-auth/oauth-provider@1.6.11","@better-auth/mongo-adapter@1.6.11","@better-auth/memory-adapter@1.6.11","@better-auth/kysely-adapter@1.6.11","@better-auth/i18n@1.6.11","@better-auth/expo@1.6.11","@better-auth/electron@1.6.11","@better-auth/drizzle-adapter@1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