All vulnerabilities
CVE-2026-109346GHSA-q84f-53jg-9ppm

better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device

better-auth better-auth
Open in ThreatlineRecord JSON
CVSS
8.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.7.0-rc.3Fixed versionCVE List
Published12 Oct 2026Updated 12 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • better-authaffected: 1.3.8-beta.3 before 1.7.0-rc.3CVE List
  • better-authunaffected: 1.7.0-rc.3CVE List

References 2