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CVE-2026-109346 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-451	User Interface (UI) Misrepresentation of Critical Information	[email protected]

Affected Products

Product	Versions
better-auth	>= 1.3.8-beta.3, < 1.7.0-rc.3 (semver)
CPE cpe:2.3:a:better-auth:better_auth::::::node.js::* Remediation Upgrade: 1.7.0-rc.3moderate effort Workaround:low effort Disable the `deviceAuthorization()` plugin. Workaround:low effort Block untrusted access to `/device/code`. Workaround:low effort Configure a strict `validateClient` allowlist. Note that this does not provide users with the necessary approval information. Workaround:moderate effort Build a custom approval endpoint that retrieves the pending request from trusted server-side storage. Map the verified client identifier to a trusted display name and show the exact requested permissions and user code. Keep approval disabled until this information is loaded. Mitigation:low effort Instruct users to reject device requests they did not initiate. They should only approve requests when the same code is visible on a device they own.

Product

Versions

better-auth

>= 1.3.8-beta.3, < 1.7.0-rc.3 (semver)

CPE

cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*

Remediation

Upgrade: 1.7.0-rc.3moderate effort
Workaround:low effort
Disable the `deviceAuthorization()` plugin.
Workaround:low effort
Block untrusted access to `/device/code`.
Workaround:low effort
Configure a strict `validateClient` allowlist. Note that this does not provide users with the necessary approval information.
Workaround:moderate effort
Build a custom approval endpoint that retrieves the pending request from trusted server-side storage. Map the verified client identifier to a trusted display name and show the exact requested permissions and user code. Keep approval disabled until this information is loaded.
Mitigation:low effort
Instruct users to reject device requests they did not initiate. They should only approve requests when the same code is visible on a device they own.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 26, 2026	CVE Modified	CISA-ADP
Oct 12, 2026	New CVE Received	[email protected]