Cross-Site Scripting Vulnerability in MaxSite CMS Antispam Plugin
CVE-2026-7011

4.8MEDIUM

Key Information:

Vendor

Maxsite

Status
Cms
Vendor
CVE Published:
26 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7011?

A vulnerability has been identified in the Antispam Plugin of MaxSite CMS versions up to 109.3, arising from inadequate input validation for the argument 'f_logging_file' in the /admin/plugin_antispam file. This flaw allows remote attackers to exploit the system by injecting malicious scripts, leading to cross-site scripting (XSS) attacks. The vendor has addressed this issue in version 109.4, which includes a fix that enforces proper filtering through the htmlspecialchars() function to prevent such exploits. Users are strongly advised to upgrade to the latest version to safeguard against potential attacks.

Affected Version(s)

CMS 109.0

CMS 109.1

CMS 109.2

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-2026-7011 - Proof of Concept

References

https://vuldb.com/vuln/359591
vdb-entrytechnical-description
https://vuldb.com/vuln/359591/cti
signaturepermissions-required
https://vuldb.com/submit/796736
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
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

konchan (VulDB User)
VulDB CNA Team
.