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CVE-2026-86813

MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To

CVSS 3.1 4.8 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-86813

Published

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 versions, risk and source history

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Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-86813 · CVE overview and exploitation status

cve-program · CVE-2026-86813

Related changes

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An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

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