CVE-2026-109346

better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device

State: Published
Severity: 8.5 High
Published: Oct 12, 2026
Updated: Oct 26, 2026
Reserved: Oct 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.5 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-451 User Interface (UI) Misrepresentation of Critical Information

Affected Products

Product	Versions
better-authbetter-auth	1.3.8-beta.3 to before 1.7.0-rc.3Affected 1.7.0-rc.3Not affected

References

GitHub Security Advisory (GHSA-q84f-53jg-9ppm)vendor-advisory
VulnCheck Advisory: better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /devicethird-party-advisory

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