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CVE-2026-87928

MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page

CVSS 4.0 5.1 MEDIUMCVSS 3.1 5.4 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-87928

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87928

Published

MaxSite CMS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "vendor": "MaxSite",
                    "product": "MaxSite CMS",
                    "packageURL": "pkg:github/maxsite/cms",
                    "repo": "https://github.com/maxsite/cms",
                    "versions": [
                        {
                            "version": "0.94",
                            "lessThanOrEqual": "109.6",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON