All vulnerabilities
CVE-2026-110862GHSA-965c-763c-88jm

better-auth: Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link

better-auth better-auth
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.32%Chance of exploitation activity in the next 30 days, higher than 23% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.7.7Fixed versionCVE List
Published14 Oct 2026Updated 15 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 1.4.0-beta.18 before 1.7.7 contains an authentication bypass vulnerability that allows unauthenticated attackers to sign in as other users by reusing OAuth state values as Magic Link tokens. Attackers can start an OAuth sign-in with a victim's email and submit the returned state to Magic Link verification, gaining sessions or creating falsely email-verified accounts.

Text from CVE List

Affected versions 2

  • better-authaffected: 1.4.0-beta.18 before 1.7.7CVE List
  • better-authunaffected: 1.7.7CVE List

References 2