Cross-Site Scripting in MetForm WordPress Plugin Affects Email Notifications
CVE-2026-86833

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Metform
Vendor
CVE Published:
7 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86833?

The MetForm plugin for WordPress prior to version 4.3.1 is susceptible to Cross-Site Scripting (XSS) attacks. It allows adversaries to exploit a lack of sanitization and escaping of form-field values before they are embedded into the HTML body of email notifications. This oversight permits unauthorized users to inject arbitrary markup into emails sent to both administrators and users, potentially leading to harmful exploits and compromising user data integrity.

Affected Version(s)

MetForm 0 < 4.3.1

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-2026-86833 - Proof of Concept

References

https://wpscan.com/vulnerability/6d6850d6-6fdf-4b97-9ccb-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

vuxvinh
WPScan
.