CVE-2026-45337

Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending

State: Published
Severity: 7.6 High
Published: Jul 15, 2026
Updated: Jul 15, 2026
Reserved: May 11, 2026

Description

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in version 1.6.11.

Scores

CVSS	Score	Vector	Source
3.1	7.6 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L	GitHub_M

Weaknesses

CWE-285 Improper Authorization
CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
better-authbetter-auth	>= 1.6.0, < 1.6.11Affected

References

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