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CVE-2026-73679: ImpressCMS Authenticated RCE via PHP Custom Tag eval()

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-14 · updated 2026-08-26
• Weakness: CWE-94

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.

Affected products

• ImpressCMS: through 2.0.3

References

• 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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