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  4. CVE 2026 108566 instantsoft icms2 private message indextplphp
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Back to active CVEs
Medium · CVSS 5.1CVE-2026-108566

InstantSoft icms2 Private Message index.tpl.php index cross site scriptingCVE-2026-108566

Answer in brief

CVE-2026-108566 records a Medium severity (CVSS 5.1) vulnerability in InstantSoft icms2 Private Message index.tpl.php index cross site scripting. The current sources do not mark it as known exploited. The current feed maps InstantSoft/icms2 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 11, 2026Updated Oct 11, 2026Source checked Oct 11, 2026First seen by HOL Oct 11, 2026Material review Oct 11, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps InstantSoft/icms2 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
InstantSoft/icms2generic2.18.0 || 2.18.1 || 2.18.2Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for InstantSoft/icms2.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 11, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • InstantSoft icms2 Image image.php files_delete_file path traversalSame instantsoft/icms2 package
  • InstantSoft icms2 Billing paypal.php validatePaypalOrder data authenticitySame instantsoft/icms2 package
  • click5 CRM add-on to Ninja Forms <= 1.0.1 - Unauthenticated Stored XSS via post_notificationsAlso CWE-79
  • click5 CRM add-on to WPForms <= 1.0.3 - Unauthenticated Stored XSS via post_notificationsAlso CWE-79
  • click5 CRM add-on to Gravity Forms <= 1.0.3 - Unauthenticated Stored XSS via post_notificationsAlso CWE-79
  • click5 CRM add-on to Contact Form 7 <= 1.0.4 - Unauthenticated Stored XSS via post_notificationsAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79, CWE-94
Source
CVE List V5
Source checked
Oct 11, 2026
References
6 linked sources
Open source record