{"id":"CVE-2026-110863","revision":"707e194b51e94a1ca3ca32da4d0543b4","records":[{"revision":"707e194b51e94a1ca3ca32da4d0543b4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-110863","aliases":[],"title":"Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers","description":"Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass vulnerability that allows authenticated users to sign in as other users by registering a personal SSO provider. Attackers can copy a legitimate provider's OIDC issuer or SAML entity ID and assert a victim's subject or NameID, because account lookup ignores providerId, creating sessions for victim accounts.","state":0,"publishedAt":"2026-10-14T22:52:50.378+00:00","modifiedAt":"2026-10-16T17:14:33.345+00:00","affected":[{"ecosystem":"Vendor product","name":"sso","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"better-auth\",\n                    \"product\": \"sso\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/%40better-auth/sso\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.7.0-rc.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"1.7.3\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.6,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":"HIGH"}],"references":["https://github.com/better-auth/better-auth/security/advisories/GHSA-mx9r-x6ww-qjw9","https://www.vulncheck.com/advisories/better-auth-better-auth-sso-before-1.7.3-authentication-bypass-via-personal-sso-providers"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110863","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-110863","identifiers":["CVE-2026-110863"]},"retained":false,"historicalAffected":[]}],"coverage":[]}