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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Thu, 24 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 14 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Impresscms
Impresscms impresscms
Vendors & Products Impresscms
Impresscms impresscms

Fri, 14 Aug 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title ImpressCMS Authenticated RCE via PHP Custom Tag eval()
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-24T14:19:10.655Z

Reserved: 2026-08-13T15:15:17.100Z

Link: CVE-2026-73679

cve-icon Vulnrichment

Updated: 2026-08-17T15:57:54.380Z

cve-icon NVD

Status : Deferred

Published: 2026-08-14T19:18:01.610

Modified: 2026-08-26T16:57:52.167

Link: CVE-2026-73679

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T21:45:03Z

Weaknesses