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 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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.8
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS probability
- 0.15%
- Published
- 2026-09-11
- Last modified
- 2026-09-11
Affected products
- Unknown MetForm