CVE-2026-86813
MEDIUM
NVD
CVSS Score
4.8
Severity
MEDIUM
Published
Sep 11, 2026
Vendor
unknown
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.