Medium severity4.8NVD Advisory· Published Sep 11, 2026· Updated Sep 11, 2026
CVE-2026-86813
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.
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Affected products
2- Range: <4.1.9
Patches
Vulnerability mechanics
References
1News mentions
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