Is CVE-2026-86813 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-86813?

CVE-2026-86813 has a CVSS v3 severity of MEDIUM (4.8).

Back

CVE-2026-86813

Description

The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted field value is configured to populate a header.