# CVE-2026-87928

## Summary

- **CVE ID:** CVE-2026-87928
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-434
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## 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.

## Affected Products

- MaxSite — MaxSite CMS (0.94)

## References

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

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._