CVE-2026-109346
better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-451 |
| Vendor | better-auth |
| Product | better-auth |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
better-auth / better-auth
1.3.8-beta.3 < 1.7.0-rc.3
References
Credits
🔍 XlabAITeam 🔍 liangjs