MajorCritical vulnerability

CVE-2026-109346 (CVSS 8.5)

NVD · officialPublished Oct 12, 2026Risk 37/100

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.

Technical details

CVSS

8.5

AV:NetworkAC:LowPR:NoneUI:Active

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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