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Vulnerability record · CVE-2026-73679 · published 14 August 2026

CVE-2026-73679: Code injection vulnerability

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.

8.6 CVSS 4.0 High EPSS 1.1% · top 35.0% CWE-94 · Code injection Deferred
8.6CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
26 Aug 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-73679), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.