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CVE-2026-87928— MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page

Quick assessment

Affected
MaxSite MaxSite CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MaxSite CMS 版本 0.94 至 109.6 在 上传处理器中存在跨站脚本（XSS）漏洞，该漏洞允许任何已登录用户上传 HTML 文件。攻击者可以向 目录上传包含恶意脚本的 HTML 文件；当访客访问该文件时，脚本将在其浏览器中执行，从而实施持久化存储型跨站脚本攻击。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87928

Vulnerability Information
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Vulnerability Title
MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MaxSite MaxSite CMS 0.94 ~ 109.6 -

II. Public POCs for CVE-2026-87928

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III. Intelligence Information for CVE-2026-87928

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Vendor Pages for CVE-2026-87928 (1)

Other References for CVE-2026-87928 (3)

Same Patch Batch · MaxSite · 2026-09-09 · 4 CVEs total

CVE-2026-87929 9.8 CRITICAL MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
CVE-2026-87927 8.2 HIGH MaxSite CMS through 109.6 Local File Inclusion via ajax dispatcher
CVE-2026-87930 8.1 HIGH MaxSite CMS through 109.6 PHP Object Injection via ci_session

IV. Related Vulnerabilities

Same product: MaxSite CMS
Same vendor: MaxSite
Same weakness: CWE-434

V. Comments for CVE-2026-87928

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