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CVE-2026-73679

ImpressCMS Authenticated RCE via PHP Custom Tag eval()

Published: Aug 14, 2026Updated: Aug 17, 2026 Sources: CVE List NVDCWE-94
7.2HIGH
NVD MITRE
EPSS Score
0.6%
Top 53.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

ImpressCMS
oss-project
ImpressCMSOn-prem
Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/ImpressCMS/impresscms
github.com
https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.md
github.com
https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-eval
vulncheck.com

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