What is CVE-2026-87928?

CVE-2026-87928 is a medium-severity vulnerability in Maxsite Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.4/10. Published 2026-09-09.

How severe is CVE-2026-87928?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Arbitrary file upload in Maxsite Cms

CVE-2026-87928

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.

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Maxsite Cms

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-87928?: CVE-2026-87928 is a medium-severity vulnerability in Maxsite Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.4/10. Published 2026-09-09.
How severe is CVE-2026-87928?: Medium severity. CVSS v3 base score is 5.4 out of 10.