Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-45337Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending

High 7.6

In plain English

A high-severity insufficient verification of data authenticity in better-auth from better-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.2%top 88.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	better-auth	1.6.11	GHSA-cq3f-vc6p-68fh

Affected products (as reported)

Vendor	Product	Versions
better-auth	better-auth	>= 1.6.0, < 1.6.11

Weakness: CWE-285, CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-cq3f-vc6p-68fh x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9573 x_refsource_MISC
https://github.com/better-auth/better-auth/commit/99a254a79b59d5a3f5ca2123260118cddb5beed7 x_refsource_MISC
https://github.com/better-auth/better-auth/releases/tag/v1.6.11 x_refsource_MISC