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CVE-2026-86834: MetForm 2.2.1 to before 4.3.1
CVE-2026-86834. CVSS 3.1 base score 3.7 (LOW, Source advisory). EPSS 0.00145 (percentile 0.03248), scored 03-Oct-2026.
Affected technology
MetForm · 2.2.1 to before 4.3.1
Vendor not specified by the source
Description’s affected range: before 4.3.1 does not properly restrict access to a debug file it writes to the web root on every form submission when its HubSpot Forms integration is enabled
Component: Not specified by the source
Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
The source says the MetForm WordPress plugin before 4.3.1 does not properly restrict access to a debug file it writes to the web root on every form submission when its HubSpot Forms integration is enabled, allowing unauthenticated attackers to read upstream API response data, including correlation identifiers and cookies. Source advisory’s CVSS 3.1 assessment (base score 3.7/10) rates confidentiality impact as low; integrity and availability impact as none.
- CWE
- CWE-200
- CCR priority
- 14.8 /100 (P5)
- CVSS 3.1
- 3.7 /10 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N · Source advisory
- EPSS
- 0.00178 · percentile 0.06759 · 2026-10-11
- KEV
- no
Provenance
- FIRST EPSS daily exploit-probability · Source record · observed 2026-10-11 23:42:05.235979+00:00 UTC
- GitHub Advisory Database · Source record · observed 2026-10-04 06:01:24.332572+00:00 UTC
- NVD CVE API 2.0 · Source record · observed 2026-10-06 17:55:17.257073+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-86834.html