CVE-2026-86833

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

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.

Affected

MetForm

CVSS v3.1 WPSCAN

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

0.16% chance of exploitation in the next 30 days, 5th percentile

Published

2026-10-07

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/6d6850d6-6fdf-4b97-9ccb-c90f9ed01ab0/

References

• CVE Record
• NVD entry