CVE-2026-45337CWE-285CWE-345

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

High · published July 15, 2026

CVSS v3.1
7.6
EPSS
0%
Percentile
11.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00214 · 11.1th percentile
Weaknesses
CWE-285 · Improper Authorization; CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-07-15T17:31Z
EPSS history
Timeline
  • 15 JUL 17:31Z
    Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending
    cvelistv5