Cross-Site Scripting Vulnerability in MaxSite CMS Mail_Send Plugin
CVE-2026-7013

4.8MEDIUM

Key Information:

Vendor

Maxsite

Status
Cms
Vendor
CVE Published:
26 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7013?

A security vulnerability within the mail_send plugin of MaxSite CMS versions up to 109.3 allows attackers to exploit improper input handling, leading to cross-site scripting attacks. This issue arises when the arguments f_subject, f_files, and f_from are manipulated, enabling remote execution of scripts. The MaxSite team has since addressed this issue in version 109.4 by reinforcing secure coding practices and implementing necessary filters. Users of affected versions are strongly recommended to upgrade to the latest version to mitigate potential threats.

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-2026-7013 - Proof of Concept

References

https://vuldb.com/vuln/359592
vdb-entrytechnical-description
https://vuldb.com/vuln/359592/cti
signaturepermissions-required
https://vuldb.com/submit/796738
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
.