CVE-2026-73679ImpressCMS Authenticated RCE via PHP Custom Tag eval()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ImpressCMS ImpressCMS impresscms:impresscms (from the name) | through 2.0.3 | CNA record |
References
- https://github.com/ImpressCMS/impresscmsproduct
- https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.mdtechnical-description
- https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-evalthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.