CVE WatchSep 8, 2026

CVE-2026-54611

InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allow

CVSS

5.5

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 8, 2026 · Last modified: Sep 8, 2026 · CWE-94 · CWE-434

EPSS · 30d

Not enough EPSS history yet.

Technical description

InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allows remote authenticated attackers to execute any PHP code via the component installer. It is possible to upload a malicious component into the server, however, it won't be installed, but upload files will be executed. Normally all php files in upload folder are not executed, however, by uploading custom .htaccess it becomes possible. Version 2.18.2 contains a fix.

Official references

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