CVE-2026-45337

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.

Score

CVSS 3.1 7.6 High

Status

Analyzed - security-advisories@github.com

Published

2026-07-15

Last modified

2026-07-15

Weaknesses

CWE-285, CWE-345

Affected products

• Better-auth (Better-auth)
• Better Auth (Better-auth)

References

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