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TI-2026-68964 Aliases CVE-2026-86833GHSA-fv77-662p-ggvf

HTML injection in MetForm notification emails via form fields

Priority LOW 24CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notifications. An unauthenticated attacker can inject arbitrary markup into the administrator and submitter notification emails the site sends, and a user must interact with the content for the injection to take effect. The record cites CWE-74 and an exploit link in its references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notifications, allowing unauthenticated attackers to inject arbitrary markup into the administrator and submitter notification emails the site sends.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00162 5th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed MetForm (Unknown): 4.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownMetFormbefore 4.3.14.3.1Patch availableCNA
  • MetForm VendorUnknown Affected before 4.3.1 Fixed in 4.3.1 Patch available CNA

Remediation

Update MetForm to version 4.3.1, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA MetForm (Unknown) Fixed in 4.3.1

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-86833
  2. 2026-10-07 Alias added: GHSA-fv77-662p-ggvf
  3. 2026-10-07 Weakness changed · CISA ADP
  4. 2026-10-07 CISA SSVC decision points changed
  5. 2026-10-07 Priority changed: MEDIUM → LOW

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences