Cross-Site Scripting Vulnerability in MaxSite CMS by MaxSite
CVE-2026-87928

5.1MEDIUM

Key Information:

Vendor

Maxsite

Status
Maxsite Cms
Vendor
CVE Published:
9 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-87928?

MaxSite CMS versions 0.94 through 109.6 are plagued by a cross-site scripting vulnerability located within the admin_page upload handler. This flaw permits any authenticated user to upload HTML files, which may contain malicious scripts. Once these files are placed in the uploads/_pages/ directory, they execute in the browsers of visitors accessing the site, leading to persistent stored cross-site scripting attacks that can compromise user data.

Affected Version(s)

MaxSite CMS 0.94 <= 109.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-87928 - Proof of Concept

References

https://github.com/maxsite/cms
product
https://github.com/EviL0rd/maxsite-cve2/blob/main/2026.09...
exploittechnical-description
https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25db...
technical-description

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

EVIL0RD
.