---
id: CVE-2026-109346
title: >-
  better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI
  misrepresentation vulnerability in the deviceAuthorization plugin because GET
  /device omits the requesting client_id and scope
summary: >-
  better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI
  misrepresentation vulnerability in the deviceAuthorization plugin because GET
  /device omits the requesting client_id and scope. Attackers can start a device
  request via /devic…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-451
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:31.367'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109346'
references:
  - url: >-
      https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-12T18:00:08.209Z'
vendor: better-auth
product: better-auth
affected:
  - better-auth >= 1.3.8-beta.3 < 1.7.0-rc.3
epss: 0.00278
epssPercentile: 0.20389
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-26T16:35:07.730406Z'
---

## Overview

better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin because GET /device omits the requesting client_id and scope. Attackers can start a device request via /device/code, trick signed-in users into approving the code, then redeem it at /device/token for a live session token.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.