---
id: CVE-2026-108566
title: A vulnerability has been found in InstantSoft icms2 up to 2.18.2
summary: >-
  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 a…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-79
  - CWE-94
published: '2026-10-11'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T13:29:12.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108566'
references:
  - url: 'https://github.com/instantsoft/icms2/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/instantsoft/icms2/commit/3a1ec8fcb073a46d06a2ab83bc2bf68225834281
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-108566'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/954247'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/416223'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/416223/cti'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/954247'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00241
epssPercentile: 0.15163
ingestedAt: '2026-10-11T10:46:31.008Z'
vendor: InstantSoft
product: icms2
affected:
  - icms2 2.18.0
  - icms2 2.18.1
  - icms2 2.18.2
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T13:00:51.951525Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.