CVSS 3.1
5.5 mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:HCVE-2026-54611
Medium (5.5). EPSS 0.7% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-94, CWE-434
- Published
- Modified
- Record from
- the NVD, synced