CVE-2026-86813
MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
- State
- Published
- Severity
- 4.8 Medium
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Reserved
- Sep 8, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | WPScan |
Weaknesses
- CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Products
| Product | Versions |
|---|---|
MetFormUnknown |
|
References
- https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/exploitvdb-entrytechnical-description
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