CVE-2026-40767 Overview
CVE-2026-40767 is a broken access control vulnerability affecting the wpForo Forum plugin for WordPress in versions prior to 3.0.2. The flaw allows unauthenticated attackers to access functionality or data that should require authentication. The weakness is classified under CWE-281: Improper Preservation of Permissions.
The vulnerability is exploitable over the network without authentication or user interaction. Attackers can target exposed WordPress installations directly, making any internet-facing forum a potential entry point for data exposure.
Critical Impact
Unauthenticated remote attackers can bypass access controls in wpForo Forum versions before 3.0.2 to read information protected by the plugin's permission model.
Affected Products
- wpForo Forum plugin for WordPress, versions prior to 3.0.2
- WordPress sites running vulnerable wpForo installations
- Any forum deployment exposing wpForo endpoints to unauthenticated network traffic
Discovery Timeline
- 2026-06-15 - CVE-2026-40767 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-40767
Vulnerability Analysis
The vulnerability stems from missing or insufficient permission enforcement within the wpForo Forum plugin. wpForo implements a role-based permission system to control who can view forum content, post replies, and access user data. Versions before 3.0.2 fail to consistently validate caller permissions before exposing protected resources.
The issue maps to CWE-281: Improper Preservation of Permissions, which describes code paths that fail to maintain permission state across operations. Patchstack catalogs this as a broken access control issue impacting plugin endpoints reachable without authentication. See the Patchstack WP Foro Vulnerability advisory for the vendor-supplied analysis.
Exploitation impacts confidentiality. The CVSS vector indicates no impact to integrity or availability, consistent with information disclosure outcomes rather than data modification or service disruption.
Root Cause
The root cause is improper permission preservation in plugin request handlers. Functions that return forum content or user-scoped data do not re-check the caller's capability before serving the response. Unauthenticated requests therefore receive data intended only for authenticated or privileged forum roles.
Attack Vector
An attacker sends crafted HTTP requests to the WordPress site hosting the vulnerable plugin. No credentials, tokens, or user interaction are required. The attacker enumerates wpForo endpoints and retrieves data normally gated behind the plugin's permission checks. The exact endpoints affected are documented in the Patchstack advisory.
The vulnerability is described in prose because no public proof-of-concept code is currently available in the enriched data.
Detection Methods for CVE-2026-40767
Indicators of Compromise
- Unauthenticated HTTP requests to wpForo plugin endpoints (paths containing wpforo or wp-admin/admin-ajax.php with wpForo actions) from unexpected source IPs
- Spikes in 200 OK responses to wpForo endpoints lacking valid WordPress session cookies
- Sequential enumeration patterns against forum user, topic, or private message endpoints
Detection Strategies
- Inventory all WordPress installations and identify sites running wpForo Forum below version 3.0.2
- Review web server access logs for anonymous traffic to wpForo routes, focusing on user-data and private-content endpoints
- Deploy WordPress security plugins or web application firewall (WAF) rules that flag access-control anomalies on plugin endpoints
Monitoring Recommendations
- Forward WordPress and reverse-proxy logs to a centralized logging platform and alert on high-volume unauthenticated access to wpForo endpoints
- Monitor outbound data volumes from WordPress hosts for unusual patterns indicating bulk content scraping
- Track plugin version drift across hosted WordPress sites to detect installations still running pre-3.0.2 builds
How to Mitigate CVE-2026-40767
Immediate Actions Required
- Upgrade the wpForo Forum plugin to version 3.0.2 or later on every WordPress installation
- Audit forum content and user data exposure since the vulnerable version was deployed
- Restrict administrative access to WordPress hosts and rotate any credentials that may have been exposed through forum profile data
Patch Information
The vendor fixed the issue in wpForo Forum 3.0.2. Update through the WordPress plugin manager or by replacing the plugin files manually. Verify the installed version after update by checking the WordPress Plugins page. Refer to the Patchstack WP Foro Vulnerability advisory for vendor guidance.
Workarounds
- Temporarily disable the wpForo Forum plugin if immediate patching is not feasible
- Place vulnerable wpForo endpoints behind authentication at the web server or WAF layer until the update is applied
- Block anonymous access to /wp-admin/admin-ajax.php requests targeting wpForo actions through WAF rules
# Example WP-CLI commands to identify and update vulnerable installations
wp plugin get wpforo --field=version
wp plugin update wpforo --version=3.0.2
wp plugin deactivate wpforo # Temporary mitigation if patching is delayed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
