CVE-2026-86813CWE-93

CVE-2026-86813

Medium · published September 11, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
14.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00243 · 14.7th percentile
Weakness
CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')
Published
2026-09-11T15:16Z
References (1)
https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/ · [email protected]
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 10:56Z
    MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
    cvelistv5