{"id":"CVE-2026-67328","title":"@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users","summary":"@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orp…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-79"],"published":"2026-08-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:34:34.997","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67328","references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-prpr-5gj3-qqhg","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/better-auth-sso-before-account-takeover-via-sso","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00278,"epssPercentile":0.20531,"ingestedAt":"2026-08-02T07:18:02.367Z","slug":"CVE-2026-67328","body":"## Overview\n\n@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}