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.
Published: 2026-09-11
Score: 4.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 11 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-93
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 11 Sep 2026 11:00:00 +0000

Type Values Removed Values Added
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.
Title MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-09-11T12:06:35.387Z

Reserved: 2026-09-08T13:37:59.083Z

Link: CVE-2026-86813

cve-icon Vulnrichment

Updated: 2026-09-11T12:05:27.346Z

cve-icon NVD

Status : Received

Published: 2026-09-11T11:16:57.267

Modified: 2026-09-11T11:16:57.267

Link: CVE-2026-86813

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-93

    Improper Neutralization of CRLF Sequences ('CRLF Injection')