@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.
CVSS v3.1 Score
8.1
/ 10.0
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Information
- Published
- 1 août 2026
- Updated
- 1 août 2026
- Status
- Received
- Source
- disclosure@vulncheck.com
Weaknesses (CWE)
CWE-79
Similar CVEs
Other vulnerabilities of type CWE-79
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