Cross Site Scripting Vulnerability in MaxSite CMS Guestbook Plugin
CVE-2026-7015

4.8MEDIUM

Key Information:

Vendor

Maxsite

Status
Cms
Vendor
CVE Published:
26 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7015?

A vulnerability exists in MaxSite CMS affecting the Guestbook Plugin, allowing for cross site scripting (XSS) attacks. This issue is due to improper handling of inputs such as f_text, f_slug, f_limit, and f_email, which can be exploited remotely. The vendor has identified this issue and issued a patch addressing the lack of adequate filtering of user inputs via htmlspecialchars(). Users are strongly advised to upgrade to version 109.4 to mitigate this vulnerability.

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-2026-7015 - Proof of Concept

References

https://vuldb.com/vuln/359595
vdb-entrytechnical-description
https://vuldb.com/vuln/359595/cti
signaturepermissions-required
https://vuldb.com/submit/796740
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
.