Type Confusion in ImpressCMS

CRITICAL 9.8CVE-2021-26600 · GHSA-m8xh-cqc2-5q6f · Published 28/03/2022 · updated 17/06/2026

In short

CVE-2021-26600 is a CRITICAL (CVSS 9.8) vulnerability affecting impresscms/impresscms, impresscms (impresscms).
Chance of exploitation in the next 30 days (EPSS): 5.6%, higher than 92.9% of all vulnerabilities.
Fix: update to 1.4.3 or later.

Package	Affected versions	Patched versions
impresscms/impresscms Packagist	`< 1.4.3`	`1.4.3`
impresscms impresscms	`< 1.4.3`	`1.4.3`

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

NVD description

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

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

Packagist

< 1.4.3

1.4.3

< 1.4.3

1.4.3

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