CVE-2026-25441: LeadConnector Auth Bypass Vulnerability

CVE-2026-25441 Overview

A Missing Authorization vulnerability has been identified in the LeadConnector WordPress plugin. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within WordPress sites running the affected plugin versions.

Critical Impact

Unauthenticated attackers can bypass access controls and perform unauthorized actions on WordPress sites using LeadConnector plugin versions through 3.0.21.

Affected Products

• LeadConnector WordPress Plugin versions through 3.0.21

Discovery Timeline

• 2026-02-19 - CVE-2026-25441 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-25441

Vulnerability Analysis

This vulnerability stems from CWE-862 (Missing Authorization), a critical weakness where the application fails to properly verify that a user is authorized to perform a requested action. In the context of the LeadConnector WordPress plugin, the application does not adequately enforce access control checks on certain functionality, allowing unauthorized users to perform actions that should be restricted.

The vulnerability is network-accessible and requires no authentication or user interaction to exploit, making it particularly concerning for internet-facing WordPress installations. The impact is primarily on system integrity, as attackers can modify data or settings without proper authorization.

Root Cause

The root cause is a Missing Authorization check (CWE-862) within the LeadConnector plugin's codebase. The plugin fails to implement proper capability checks or nonce verification on one or more endpoints, allowing unauthenticated or unauthorized users to access restricted functionality. This is a common vulnerability pattern in WordPress plugins where developers neglect to use functions like current_user_can() or check_ajax_referer() to validate user permissions before processing requests.

Attack Vector

The attack vector is network-based, requiring no privileges or user interaction. An attacker can remotely target WordPress sites with the vulnerable LeadConnector plugin installed by sending crafted HTTP requests to the unprotected endpoints. Since no authentication is required, any internet user can potentially exploit this vulnerability against affected sites.

The exploitation flow typically involves:

1. Identifying a WordPress site running LeadConnector plugin version 3.0.21 or earlier
2. Sending crafted requests to the unprotected plugin endpoints
3. Performing unauthorized actions that bypass access control mechanisms

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-25441

Indicators of Compromise

• Unexpected modifications to WordPress site settings or content without corresponding admin activity
• Unusual HTTP requests targeting LeadConnector plugin endpoints from external IP addresses
• Log entries showing successful plugin API calls without associated authenticated user sessions

Detection Strategies

• Review web server access logs for suspicious requests targeting /wp-content/plugins/leadconnector/ paths
• Monitor WordPress audit logs for unauthorized changes to plugin settings or site configurations
• Implement Web Application Firewall (WAF) rules to detect and block exploitation attempts against LeadConnector endpoints

Monitoring Recommendations

• Enable comprehensive WordPress activity logging to capture all plugin-related actions
• Configure alerting for any LeadConnector plugin activity from unauthenticated sessions
• Regularly audit plugin permissions and access control configurations

How to Mitigate CVE-2026-25441

Immediate Actions Required

• Update the LeadConnector plugin to a version newer than 3.0.21 that addresses this vulnerability
• If an update is not available, consider temporarily disabling the LeadConnector plugin until a patch is released
• Review WordPress audit logs for any signs of exploitation or unauthorized access

Patch Information

Organizations should monitor the WordPress plugin repository and the Patchstack security advisory for updated versions of the LeadConnector plugin that address this missing authorization vulnerability. Apply the security patch as soon as it becomes available.

Workarounds

• Implement Web Application Firewall rules to restrict access to LeadConnector plugin endpoints
• Limit access to the WordPress admin area using IP allowlisting where feasible
• Consider temporarily deactivating the LeadConnector plugin if it is not critical to site operations

# WordPress CLI command to check LeadConnector plugin version
wp plugin list --name=leadconnector --fields=name,version,status

# Temporarily disable the vulnerable plugin if needed
wp plugin deactivate leadconnector