---
id: CVE-2026-86833
title: >-
  The MetForm WordPress plugin before 4.3.1 does not sanitize or escape
  submitted form-field values before inserting them into the HTML body of its
  email notifications, allowing unauthenticated attackers to inject arbitrary
  markup into the…
summary: >-
  The MetForm WordPress plugin before 4.3.1 does not sanitize or escape
  submitted form-field values before inserting them into the HTML body of its
  email notifications, allowing unauthenticated attackers to inject arbitrary
  markup into the…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-74
product: MetForm
affected:
  - MetForm < 4.3.1
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T10:17:39.117'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86833'
references:
  - url: 'https://wpscan.com/vulnerability/6d6850d6-6fdf-4b97-9ccb-c90f9ed01ab0/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T09:49:24.362509Z'
ingestedAt: '2026-10-07T08:20:03.942Z'
---

## Overview

The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notifications, allowing unauthenticated attackers to inject arbitrary markup into the administrator and submitter notification emails the site sends.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.