CVE-2026-53514
Better Auth vulnerable to unauthorized invitation acceptance via unverified email match in organization plugin
Impact
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, and in 1.6.14 and later when invitation IDs can be obtained outside the invited mailbox and requireEmailVerificationOnInvitation: true is not enabled, the organization plugin's acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations recipient endpoints use session.user.email and an invitation ID without sufficient verified-email ownership proof, allowing a user with an unverified session for the invited email address to accept an organization invitation after obtaining the invitation ID. This issue is fixed for the original default behavior in version 1.6.11, while 1.6.14 restored compatibility for built-in opaque invitation IDs and leaves affected configurations requiring secure options.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | better-auth | < 1.6.11 | 1.6.11 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Better-Auth | Better Auth | before 1.6.11 from 1.6.14 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fmh4-wcc4-5jm3
- https://github.com/better-auth/better-auth/security/advisories/GHSA-fmh4-wcc4-5jm3
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11
- https://nvd.nist.gov/vuln/detail/CVE-2026-53514
- https://github.com/better-auth/better-auth/pull/9577
- https://github.com/better-auth/better-auth/commit/23094a628f007f801be6d26e5b15dc5fc6fc4eb8