All vulnerabilities
CVE-2026-110864GHSA-r4xp-prcw-77qf

better-auth: Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy

better-auth better-auth
Open in ThreatlineRecord JSON
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.29%Chance of exploitation activity in the next 30 days, higher than 20% 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 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy plugin that allows unauthenticated attackers to sign in as other users by forging encrypted profiles. When the proxy shares the global secret and cookie-stored state is used, attackers can obtain encrypted state for a fake profile with a victim's verified email to take over the account via implicit linking.

Text from CVE List

Affected versions 2

  • better-authaffected: 1.5.0-beta.12 before 1.7.7CVE List
  • better-authunaffected: 1.7.7CVE List

References 2