CVE-2026-109346 better-auth - Authentication Bypass

better-auth > 1.3.8-beta.3 < 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin caused by omission of client_id and scope in GET /device, letting attackers trick signed-in users into approving device codes, exploit requires user interaction.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-451

Vendor fix

Update to version 1.7.0-rc.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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