CVE-2026-53514 Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin
Attackers can accept organization invitations without verified email ownership if specific configuration options are disabled, leading to unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-53514?
CVE-2026-53514 is a high-severity missing authorization vulnerability in better-auth, published on 15 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-53514?
2 open source packages ship an affected version, including better-auth. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
better-auth npm | All versions | 1.6.11 |
better-auth npm | All versions | 1.6.11 |
Products include Better-Auth Better Auth.
How do I fix CVE-2026-53514?
Upgrade better-auth to 1.6.11 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53514 being exploited?
There is no known exploitation of CVE-2026-53514 in the wild and no public exploit code.
Other vulnerabilities in better-auth
- CVE-2026-53512 Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins
- CVE-2026-53516 Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
- CVE-2024-56734 Better Auth has an Open Redirect Vulnerability in Verify Email Endpoint
- CVE-2026-45337 Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending
- CVE-2025-27143 Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
Sources
Also known as GHSA-fmh4-wcc4-5jm3.