CVE-2026-86834: CWE-200 Information Exposure in MetForm
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.
AI Analysis
Technical Summary
CVE-2026-86834 is an information exposure vulnerability (CWE-200) in the MetForm WordPress plugin before version 4.3.1. The flaw arises from improper access controls on a debug file that the plugin writes to the web root on each form submission when the HubSpot Forms integration is active. This allows unauthenticated attackers to access sensitive upstream API response data, including correlation identifiers and cookies, which could aid in further attacks or information gathering.
Potential Impact
Unauthenticated attackers can read sensitive debug information including API response data, correlation identifiers, and cookies. This exposure could facilitate further reconnaissance or exploitation by revealing internal identifiers and session-related data. However, there is no indication of direct code execution or privilege escalation from this vulnerability.
Mitigation Recommendations
Users should upgrade the MetForm plugin to version 4.3.1 or later, where this issue is fixed. Since the vulnerability is due to improper access controls on a debug file, applying the official update will prevent unauthorized access. No other specific mitigations are indicated.
CVE-2026-86834: CWE-200 Information Exposure in MetForm
Description
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.
CVSS v3.1
Score 3.7low
Affected software
MetForm
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86834 is an information exposure vulnerability (CWE-200) in the MetForm WordPress plugin before version 4.3.1. The flaw arises from improper access controls on a debug file that the plugin writes to the web root on each form submission when the HubSpot Forms integration is active. This allows unauthenticated attackers to access sensitive upstream API response data, including correlation identifiers and cookies, which could aid in further attacks or information gathering.
Potential Impact
Unauthenticated attackers can read sensitive debug information including API response data, correlation identifiers, and cookies. This exposure could facilitate further reconnaissance or exploitation by revealing internal identifiers and session-related data. However, there is no indication of direct code execution or privilege escalation from this vulnerability.
Mitigation Recommendations
Users should upgrade the MetForm plugin to version 4.3.1 or later, where this issue is fixed. Since the vulnerability is due to improper access controls on a debug file, applying the official update will prevent unauthorized access. No other specific mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-08T14:33:20.926Z
- State
- PUBLISHED
Threat ID: 6ac11723a43b0b3b89cacf6a
Added to database: 10/03/2026, 14:54:27 UTC
Last enriched: 10/03/2026, 14:56:38 UTC
Last updated: 10/04/2026, 02:46:07 UTC
Views: 12
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