CVE-2026-67334: better-auth Stale Sessions Persist After User Deletion

Severity: low (CVSS 3.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-01 · updated 2026-10-08
Weakness: CWE-459

Description

better-auth versions before 1.6.11 fail to delete cached sessions when removing users via admin, anonymous, or SCIM endpoints when secondaryStorage is configured and storeSessionInDatabase is false. Attackers can reuse deleted user session tokens to maintain authentication for up to seven days after account deletion.

Affected products

better-auth: from 0.3.4 before 1.6.11; from 1.6.0 before 1.6.11 — fixed in 1.6.11

How to fix

Upgrade to a fixed version: better-auth 1.6.11. Check the vendor advisory for mitigations.

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-2vg6-77g8-24mp
https://www.vulncheck.com/advisories/better-auth-stale-sessions-persist-after-user-deletion

Get alerted when CVE-2026-67334 or the next vulnerability affects your stack