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2 vulnerabilities found for sso by @better-auth

CVE-2026-53515 (GCVE-0-2026-53515)
Vulnerability from cvelistv5
Published
2026-07-15 17:27
Modified
2026-07-15 19:30
Severity ?
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
CWE
  • CWE-269 - Improper Privilege Management
  • CWE-285 - Improper Authorization
  • CWE-863 - Incorrect Authorization
Summary
Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.
References
Impacted products
Vendor Product Version
better-auth better-auth Version: >= 1.2.10, < 1.6.11
 Create a notification for this product.
Show details on NVD website

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CVE-2026-53513 (GCVE-0-2026-53513)
Vulnerability from cvelistv5
Published
2026-07-15 17:15
Modified
2026-07-15 19:29
Severity ?
9.6 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-20 - Improper Input Validation
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
  • CWE-918 - Server-Side Request Forgery (SSRF)
Summary
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.
References
Impacted products
Vendor Product Version
better-auth better-auth Version: >= 0.1.0, < 1.6.11
 Create a notification for this product.
Show details on NVD website

To clipboard 

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