Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87928

CVE-2026-87928MEDIUM

MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   P   N   N   N    5.1   .0030   20.4     —

AFFECTED
  Product      Versions  Fixed
  MaxSite CMS  0.94 –    —

TIMELINE
  Sep 9   Reserved by VulnCheck
  Sep 9   Published (CNA: VulnCheck)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-87928 (MaxSite CMS). Public exploit reference added.
  Sep 24  EXPLOIT PUBLISHED — CVE-2026-87928 (MaxSite CMS). Public exploit reference added.

CWE-434 · CNA: VulnCheck · CVSS v4.0 · 4 references · NVD status: Deferred

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by VulnCheck
September 9, 2026	Published	Published (CNA: VulnCheck)
September 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87928 (MaxSite CMS). Public exploit reference added.
September 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87928 (MaxSite CMS). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
MaxSite	MaxSite CMS	—	0.94	—

Weaknesses

CWE-434

References (4)

https://github.com/EviL0rd/maxsite-cve2/blob/main/2026.09.08-maxsite-cms-arbitrary-file-write-stored-xss.md [exploit, technical-description]
https://github.com/maxsite/cms [product]
https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/maxsite/admin/plugins/admin_page/uploads-require-maxsite.php#L1-L64 [technical-description]
https://www.vulncheck.com/advisories/maxsite-cms-0.94-through-109.6-html-upload-xss-via-admin-page [third-party-advisory]

Authoritative record: CVE-2026-87928 at cve.org

Vendors: maxsite

Weaknesses: CWE-434

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87928 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.