Message Filter for Contact Form 7 <= 1.6.3.8 - Reflected Cross-Site Scripting

2026-07-08 00:00

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Strategic Overview

Status

Patched in 1.6.3.9

Affected PluginMessage Filter for Contact Form 7

Affected Version<= 1.6.3.8

CVSS6.1Medium

CVECVE-2026-57423

View all Message Filter for Contact Form 7 vulnerabilities

Vulnerability Overview

The Message Filter for Contact Form 7 plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 1.6.3.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Technical Analysis

REMEDIATION: Update to version 1.6.3.9, or a newer patched version --- IDENTIFIER: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

External References

https://www.cve.org/CVERecord?id=CVE-2026-57423 https://www.wordfence.com/threat-intel/vulnerabilities/id/5b4f2862-c340-4637-accb-8f1ae6e432ea

CVSS Vector

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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