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CVE-2026-86813

MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To

MEDIUM
4.8
CVSS Score
Published: September 11, 2026 at 10:56 AM UTC
Updated: September 11, 2026 at 05:50 PM UTC
1 product affected across 1 vendorMetForm

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MetForm· Wpmetwordpress-plugin
60%
v < 4.1.9
Affected range stops below 4.1.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

ExploitVDB EntryTechnical Description
Source: cverecord
https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMWPScan
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-93

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