medium4.8
CVE-2026-86813
The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email head…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| MetForm WordPress Plugin | before 4.1.9 |
Versions were read from the advisory text. No structured product data has been published for this record yet.