CVE-2026-45337 Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending
An authenticated attacker can hijack pending device authorization flows by binding them to their own account or denying legitimate requests.
- 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-2026-45337?
CVE-2026-45337 is a high-severity authentication bypass 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. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in version 1.6.11.
Which versions are affected by CVE-2026-45337?
2 open source packages ship an affected version, including better-auth. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
better-auth npm | From 1.6.0 | 1.6.11 |
better-auth npm | From 1.6.0 | 1.6.11 |
Products include Better-Auth Better Auth.
How do I fix CVE-2026-45337?
Upgrade better-auth to 1.6.11 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-45337 being exploited?
There is no known exploitation of CVE-2026-45337 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-2026-53514 Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin
- CVE-2025-27143 Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
Sources
Also known as GHSA-cq3f-vc6p-68fh.