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 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73679?
CVE-2026-73679 has a high severity rating of 7.2.
How do I fix CVE-2026-73679?
To fix CVE-2026-73679, administrators should update ImpressCMS to the latest version that addresses this vulnerability.
What type of vulnerability is CVE-2026-73679?
CVE-2026-73679 is an authenticated remote code execution vulnerability categorized under code injection.
Who is affected by CVE-2026-73679?
CVE-2026-73679 affects authenticated administrators of ImpressCMS who can create custom tags with PHP type enabled.
What are the potential impacts of CVE-2026-73679?
If exploited, CVE-2026-73679 allows attackers to execute arbitrary PHP code on the server, leading to a complete system compromise.