CVE-2026-86833

MetForm < 4.3.1 - Unauthenticated HTML Injection in Notification Emails via Field Shortcodes

Published Oct 7, 2026 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Wordpress-extensions
Wordpress-extensions metform
Vendors & Products Wordpress-extensions
Wordpress-extensions metform
Type Values Removed Values Added
Weaknesses CWE-74
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-1070
CWE-20
Type Values Removed Values Added
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.
Title MetForm < 4.3.1 - Unauthenticated HTML Injection in Notification Emails via Field Shortcodes
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Oct 7, 2026, 9:49 AM
Reserved
Sep 8, 2026, 2:32 PM
Status
Deferred
Published
Oct 7, 2026, 7:17 AM
Modified
Oct 7, 2026, 2:52 PM