CVE-2026-73679 — ImpressCMS Authenticated RCE via PHP Custom Tag eval()
ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary PHP code by stori…
Published: 2026-08-14 · CVSS: 8.6 · CVSS 4.0
ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary PHP code by storing a malicious payload in a custom tag with PHP type enabled. The application decodes HTML-encoded content via undoHtmlSpecialChars() before passing it to eval() in the renderWithPhp() method, bypassing HTML Purifier sanitization, and the payload is triggered on every frontend page load through the preload event system.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7