CVE-2026-45337

HIGH

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

Title source: cna
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 7.6
EPSS 0.0014
EPSS Percentile 3.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-285 CWE-345
Status published
Products (2)
better-auth/better-auth >= 1.6.0, < 1.6.11
better-auth/better_auth 1.6.0 - 1.6.11
Published Jul 15, 2026
Tracked Since Jul 15, 2026