CVE-2026-109346

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductBetter-auth

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-451CWE-451

How to fix

Update

better-auth1.7.0-rc.3 or later

Vendor advisories

github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm

Affected products

Product	Affected versions	Fixed in
better-authnpm	1.3.8-beta.3 ≤ v < 1.7.0-rc.3	1.7.0-rc.3

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