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CVE-2026-109346

8.1, high

better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin because…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 18.9% of scored CVEs
Exploitation
No public evidence
Published
12 Oct 20265 days ago

Description

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.

Details

Vendor
Better-auth
Product
better-auth
Weakness
CWE-451 (opens in a new tab)
Status
Received
Updated
12 Oct 2026
Assigner
disclosure@vulncheck.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Better-auth CVEs

Every Better-auth CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-110862 better-auth Improper Authentication Vulnerability EPSS 0.3% 9.1, critical
  • CVE-2026-110863 Better-auth sso Improper Authentication Vulnerability EPSS 0.3% 8.1, high
  • CVE-2026-110864 better-auth Improper Authentication Vulnerability EPSS 0.3% 7.4, high

Beyond this page

Is CVE-2026-109346 in your network?

This page tells you how dangerous CVE-2026-109346 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.