CVE-2026-54611InstantCMS has Remote Code Execution in package installer
Updated under an hour ago ()
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It affects instantsoft icms2. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-94, CWE-434
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
instantsoft icms2 instantsoft:icms2 (from the name) | before 2.18.2 | CNA record |
References
- https://github.com/instantsoft/icms2/security/advisories/GHSA-vvgv-h28h-p2m5x-refsource-confirm
- https://github.com/instantsoft/icms2/commit/44f3a9d04a3207c82cdc756599cbdf084a02858fx-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.