Low severity · published Oct 11, 2026
CVE-2026-108566
InstantSoft icms2 Private Message index.tpl.php index cross site scripting
3.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IC
icms2 · InstantSoft
2.18.0; 2.18.1; 2.18.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-108566
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-108566
vdb-entry
https://vuldb.com/vuln/416223
signature
https://vuldb.com/vuln/416223/cti
third-party-advisory
https://vuldb.com/cve/CVE-2026-108566
third-party-advisory
https://vuldb.com/submit/954247
patch
https://github.com/instantsoft/icms2/commit/3a1ec8fcb073a46d06a2ab83bc2bf68225834281
product
https://github.com/instantsoft/icms2/
More from icms2
7.2
CVE-2025-59055
InstantCMS vulnerable to Server-Side Request Forgery via package installer
7.2
CVE-2024-31212
SQL injection in index_chart_data action
7.1
CVE-2026-28281
InstantCMS has Multiple CSRF Vulnerabilities
5.5
CVE-2026-54611
InstantCMS has Remote Code Execution in package installer
5.4
CVE-2024-50348
InstantCMS has a Cross Site Scripting Vulnerability