CVE Catalog

CVE-2026-86813

MediumCVSS 4.8
Published: Updated: Translated: NVD NIST

Summary

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. This allows unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends.

Risk Assessment

An attacker could intercept the content of emails sent by the site, including personal or other sensitive information, by sending copies to their own address. This may lead to data leakage and privacy breaches.

Recommendation

Update the MetForm plugin to version 4.1.9 or later. Until then, consider disabling email notification functionality or restricting header configuration options.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS