CVE-2026-73679
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
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.
Risk Assessment
Risk of complete server compromise and violation of data integrity and service availability.
Recommendation
It is recommended to immediately upgrade to the latest version of ImpressCMS and restrict administrator privileges to the minimum necessary.
Original NVD description (English source)
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.