4.8
Medium
CVE-2026-86813 The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| MetForm 4.1 | earliest → < 4.1.9 | 4.1.9 |
Other CVEs of MetForm
The 4 CVEs of MetForm →
CVE-2026-86833
The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting…
5.4
Medium
CVE-2026-86832
The MetForm WordPress plugin before 4.3.1 does not properly restrict access to form submission data, allowing…
5.3
Medium
CVE-2026-86834
The MetForm WordPress plugin before 4.3.1 does not properly restrict access to a debug file it writes to the web root…
3.7
Low