Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
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
FAQ
What is CVE-2026-73679?
CVE-2026-73679 is a vulnerability with a CVSS score of 7.2 (HIGH). 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 ...
How severe is CVE-2026-73679?
CVE-2026-73679 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73679?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.