CVE-2026-109346better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device
Updated under an hour ago ()
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EPSS puts the chance of exploitation in the next 30 days at 0.28%, higher than 19% of scored CVEs.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-451
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.28% (percentile 19)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 12, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
better-auth better-auth better_auth:better_auth (from the name) | from 1.3.8-beta.3 before 1.7.0-rc.3; 1.7.0-rc.3 not affected | CNA record |
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppmvendor-advisory
- https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-devicethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.