---
id: CVE-2026-87928
title: >-
  MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting
  vulnerability in the admin_page upload handler that allows any logged-in user
  to upload HTML files
summary: >-
  MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting
  vulnerability in the admin_page upload handler that allows any logged-in user
  to upload HTML files. Attackers can upload HTML containing malicious scripts
  to the uplo…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-434
vendor: MaxSite
product: MaxSite CMS
affected:
  - cms >= 0.94 <= 109.6
published: '2026-09-09'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:35.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87928'
references:
  - url: >-
      https://github.com/EviL0rd/maxsite-cve2/blob/main/2026.09.08-maxsite-cms-arbitrary-file-write-stored-xss.md
    label: disclosure@vulncheck.com
  - url: 'https://github.com/maxsite/cms'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/maxsite/admin/plugins/admin_page/uploads-require-maxsite.php#L1-L64
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/maxsite-cms-0.94-through-109.6-html-upload-xss-via-admin-page
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00298
epssPercentile: 0.20004
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T17:10:14.855155Z'
ingestedAt: '2026-09-10T20:32:13.442Z'
---

## Overview

MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.

## Remediation

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