High 8.1Published Oct 12, 2026

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 (Oct 28, 2026, 3:10 AM ET)

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It affects better-auth. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.28%, higher than 20% of scored CVEs.

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Exploited in the last 30 days

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 20)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 12, 2026

Affected products

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

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm	vendor-advisory
https://www.vulncheck.com/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device	third-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.