CVE-2026-45337

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account, but needs a user to act. High risk of data exposure, data tampering.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-07-15 18:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-21 04:21 UTC Last updatedMost recent change to the record

Details

Published

2026-07-15 18:16 UTC

Last modified

2026-07-21 04:21 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-285

Record status

Analyzed

Affected

• better-auth Better Auth < 1.6.11

Attack profile CVSS 3.1 · 7.6

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low