CVE-2026-86813MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To
Updated under an hour ago ()
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It affects Unknown MetForm. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-93
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- WPScan
- NVD analysis
- Deferred
- Record last updated
- Sep 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Unknown MetForm unknown:metform (from the name) | before 4.1.9 | CNA record |
References
- https://wpscan.com/vulnerability/afda2a26-b965-42cb-85a8-4a4d83ec026e/exploit, vdb-entry, technical-description
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.