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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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86813

Published

MetForm

https://wordpress.org/plugins

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Unknown",
                    "product": "MetForm",
                    "versions": [
                        {
                            "status": "affected",
                            "versionType": "semver",
                            "version": "0",
                            "lessThan": "4.1.9"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "collectionURL": "https://wordpress.org/plugins"
                }

Original source record · Cite this exact observation · Complete original publisher JSON