EUVD-2026-76041
GHSA-687m-wfrp-8mxf
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
AC:H captures the mandatory admin-configured header-mapping prerequisite; C:L and I:L reflect email content leakage and header manipulation without code execution.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Email header injection in MetForm WordPress plugin before 4.1.9 allows unauthenticated attackers to inject arbitrary SMTP headers - such as Bcc - into notification emails dispatched by the site, by embedding newline characters in form field submissions that are configured to populate those headers. This enables silent exfiltration of form submission content to attacker-controlled addresses and potential abuse of the site as a spam relay. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that at least one MetForm form on the target site has a user-submitted field explicitly configured by an administrator to populate an outgoing notification email header (e.g., Reply-To, From, or a custom header). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.8 with AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N is a reasonable characterization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update MetForm to version 4.1.9 or later, which sanitizes newline characters in user-submitted values before they are inserted into email headers. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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