CVE-2026-86813

MediumCVSS 4.8/10Last modified Sep 11, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-93

Affected software

No affected versions have been published.

Timeline

Published
Sep 11, 2026
Last modified
Sep 11, 2026
NVD status
Deferred

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