HIGH 8.6 NVD
CVE-2026-73679
ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary
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.
References
- https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.md
- https://github.com/ImpressCMS/impresscms
- https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-eval
This high severity vulnerability with a CVSS score of 8.6 was published on 2026-08-14 via NVD.
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