CVE-2026-73679CWE-94code-injection

CVE-2026-73679

High · published August 14, 2026

CVSS v3.1
7.2
EPSS
1%
Percentile
66.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.6 · 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
EPSS
0.01126 · 66.0th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-08-14T23:18Z
References (3)
https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.md · [email protected]https://github.com/ImpressCMS/impresscms · [email protected]https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-eval · [email protected]
EPSS history
Timeline
  • 14 AUG 19:03Z
    ImpressCMS Authenticated RCE via PHP Custom Tag eval()
    cvelistv5