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.
History

Wed, 09 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Instantcms
Instantcms icms2
Vendors & Products Instantcms
Instantcms icms2

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
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.
Title InstantCMS has Remote Code Execution in package installer
Weaknesses CWE-434
CWE-94
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-08T17:16:08.148Z

Updated: 2026-09-09T17:39:48.057Z

Reserved: 2026-06-15T19:45:23.540Z

Link: CVE-2026-54611

cve-icon Vulnrichment

Updated: 2026-09-09T17:39:44.303Z

cve-icon NVD

Status : Deferred

Published: 2026-09-08T18:17:41.480

Modified: 2026-09-09T18:16:59.127

Link: CVE-2026-54611

cve-icon Redhat

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