CVE-2026-86833
Received Received - Intake

Unauthenticated Stored XSS in MetForm WordPress Plugin

Publication date: 2026-10-07

Last updated on: 2026-10-07

Assigner: WPScan

Description
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.

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Meta Information

Published
2026-10-07
Last Modified
2026-10-07
Generated
2026-10-07
AI Q&A
2026-10-07
EPSS Evaluated
N/A
NVD
CVE-2026-86833
EUVD
EUVD-2026-94193

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Unknown MetForm 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

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Executive Summary

This vulnerability is an unauthenticated HTML injection issue in the MetForm WordPress plugin versions below 4.3.1. The plugin fails to sanitize or escape form-field values before inserting them into email notification HTML bodies. Attackers can inject arbitrary markup into emails sent to administrators and form submitters without authentication.

Detection Guidance

Check the installed version of the MetForm WordPress plugin. If it is below 4.3.1, the system is vulnerable. This can be done by inspecting the plugin files or using WordPress admin panel.

Impact Analysis

Attackers could inject malicious scripts or deceptive content into emails, potentially leading to phishing attacks, credential theft, or misinformation. Administrators and form submitters may receive compromised emails without any authentication required to exploit this issue.

Compliance Impact

This vulnerability could lead to unauthorized data exposure or manipulation, potentially violating GDPR's data protection principles or HIPAA's integrity and confidentiality requirements. Organizations may face compliance penalties if user data is compromised through this flaw.

Mitigation Strategies

Update the MetForm plugin to version 4.3.1 or later immediately to patch the vulnerability. If updating is not possible, consider disabling the plugin until an update is applied.

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