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CVE PROGRAM SOURCE RECORD8.6 High

CVE-2026-67328

@better-auth/sso before 1.6.21 Account Takeover via SSO

Description

@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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

better-auth sso

Default version status: unaffected

  • 0 to < 1.6.21affected
  • 1.6.21unaffected
pkg:npm/%40better-auth/sso

better-auth sso

Default version status: unaffected

  • 1.7.0-beta.0 to < 1.7.0-beta.10affected
  • 1.7.0-beta.10unaffected
pkg:npm/%40better-auth/sso

References