---
title: "CVE-2026-109346: better-auth - Authentication Bypass"
description: "better-auth > 1.3.8-beta.3 < 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin caused by omission of client_id and scope in GET /device, letting attackers trick signed-in users into approving device codes, exploit requires user interaction."
url: https://panop.io/threat-heartbeat/CVE-2026-109346/
---

# CVE-2026-109346 better-auth - Authentication Bypass

better-auth > 1.3.8-beta.3 < 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin caused by omission of client\_id and scope in GET /device, letting attackers trick signed-in users into approving device codes, exploit requires user interaction.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.28% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109346)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-451](https://cwe.mitre.org/data/definitions/451.html)

## Vendor fix

Update to version 1.7.0-rc.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-109346](https://nvd.nist.gov/vuln/detail/CVE-2026-109346)
- [https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm](https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm)
- [https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device](https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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