RCE in Instantsoft Icms2
CVE-2026-108566
A vulnerability has been found in InstantSoft icms2 up to 2.18.2. This issue affects the function index of the file templates/default/controllers/messages/index.tpl.php of the component Private Message Handler. Such manipulation of the argument nickname leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 3a1ec8fcb073a46d06a2ab83bc2bf68225834281. It is best practice to apply a patch to resolve this issue.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Instantsoft Icms2 — versions 2.18.0, 2.18.1, 2.18.2
Weakness classification (CWE)
References
- vuldb.com/vuln/416223 (technical-description, vdb-entry)
- vuldb.com/vuln/416223/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-108566 (third-party-advisory)
- vuldb.com/submit/954247 (third-party-advisory)
- github.com/instantsoft/icms2/commit/3a1ec8fcb073a46d06a2ab83bc2bf68225834281 (patch)
- github.com/instantsoft/icms2/ (product)
Frequently asked questions
- What is CVE-2026-108566?
- CVE-2026-108566 is a low-severity vulnerability in Instantsoft Icms2, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-10-11.
- How severe is CVE-2026-108566?
- Low severity. CVSS v3 base score is 3.5 out of 10.