CVE-2026-109346

CVSS 8.5 (high) · published 2026-10-12

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.

Weakness: CWE-451

Source: NVD CVE-2026-109346

References

• 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

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