CVE-2026-86813
MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | unknown |
| Product | metform |
| Published | Sep 11, 2026 |
| Last Updated | Sep 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Unknown / MetForm
0 < 4.1.9
References
Credits
Artus KG WPScan