CVE-2021-26600: Impresscms

Critical severity, CVSS 9.8. EPSS: 5.6% chance of exploitation in the next 30 days.

ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).

Affected products

• Impresscms Impresscms: before 1.4.3 (fixed in 1.4.3)

Published 2022-03-28. Last modified 2026-06-17.