Vulnerability · Published Oct 7, 2026 · Assigned by WPScan

CVE-2026-86833MetForm < 4.3.1 - Unauthenticated HTML Injection in Notification Emails via Field Shortcodes

Medium 5.4

In plain English

A medium-severity injection in MetForm from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 94.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	MetForm	0 – before 4.3.1

Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

https://wpscan.com/vulnerability/6d6850d6-6fdf-4b97-9ccb-c90f9ed01ab0/ exploit, vdb-entry, technical-description