CVE-2026-41454: WeKan Privilege Escalation Vulnerability

CVE-2026-41454 Overview

CVE-2026-41454 is a missing authorization vulnerability affecting WeKan, the open-source kanban board software, in versions prior to 8.35. The flaw exists within the Integration REST API endpoints, where authenticated board members can perform administrative actions without proper privilege verification. This authorization bypass allows attackers to enumerate integrations including webhook URLs, create new integrations, modify or delete existing integrations, and manage integration activities by exploiting insufficient authorization checks in the JsonRoutes REST handlers.

Critical Impact

Authenticated users with low-privilege board member access can escalate their privileges to perform administrative integration management tasks, potentially exposing sensitive webhook URLs and compromising integration security across the WeKan deployment.

Affected Products

• WeKan versions prior to 8.35
• WeKan Integration REST API endpoints
• Self-hosted WeKan deployments with board member access enabled

Discovery Timeline

• 2026-04-22 - CVE-2026-41454 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2026-41454

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), a critical security weakness where the application fails to perform authorization checks before allowing access to protected resources or functionality. In the context of WeKan's Integration REST API, the JsonRoutes handlers process requests from authenticated users without verifying whether those users possess the necessary administrative privileges to perform integration management operations.

The attack is network-accessible and requires only low-privilege authentication as a board member. No user interaction is required for exploitation, making this vulnerability particularly dangerous in multi-tenant or collaborative WeKan environments where numerous users may have basic board access.

Root Cause

The root cause stems from insufficient authorization validation within the WeKan Integration REST API handlers. The JsonRoutes REST framework processes authenticated requests but fails to enforce role-based access controls that should restrict integration management to administrators only. This missing authorization check allows any authenticated board member to access endpoints designed exclusively for administrative users, bypassing the intended privilege separation model.

Attack Vector

The attack vector involves authenticated network access to the WeKan application. An attacker with valid board member credentials can craft HTTP requests directly to the Integration REST API endpoints. These requests are processed without proper privilege verification, enabling the attacker to:

1. Enumerate all configured integrations and extract sensitive webhook URLs
2. Create unauthorized integrations to establish persistence or exfiltrate data
3. Modify existing integrations to redirect webhooks to attacker-controlled endpoints
4. Delete integrations to disrupt legitimate board workflows and automation

The exploitation leverages standard REST API calls, making it easily scriptable and repeatable across affected deployments.

Detection Methods for CVE-2026-41454

Indicators of Compromise

• Unusual API requests to Integration REST API endpoints from non-administrative user accounts
• Unexpected creation, modification, or deletion of integrations without corresponding admin activity
• Audit logs showing integration enumeration patterns from low-privilege board members
• Webhook URLs being accessed or modified by users who should not have integration permissions

Detection Strategies

• Implement API request logging and monitor for unauthorized access to /api/boards/*/integrations endpoints
• Review WeKan application logs for integration management activities performed by non-admin users
• Deploy web application firewall (WAF) rules to detect anomalous patterns in REST API usage
• Configure alerts for bulk integration enumeration requests that may indicate reconnaissance activity

Monitoring Recommendations

• Enable comprehensive audit logging for all Integration REST API operations
• Establish baseline behavior for integration management and alert on deviations
• Monitor for privilege escalation patterns where board members access admin-only functionality
• Integrate WeKan logs with SIEM solutions for centralized visibility and correlation

How to Mitigate CVE-2026-41454

Immediate Actions Required

• Upgrade WeKan to version 8.35 or later immediately to address this authorization bypass
• Audit existing integrations for unauthorized modifications or suspicious webhook URLs
• Review user access logs to identify potential exploitation attempts
• Temporarily restrict board member access if immediate patching is not feasible

Patch Information

The vulnerability has been addressed in WeKan version 8.35. The security patch implements proper authorization checks in the Integration REST API handlers to ensure only administrators can perform integration management operations. The fix is available in the GitHub Wekan Release v8.35 and the specific commit can be reviewed at the GitHub Wekan Commit Update. Additional technical details are available in the VulnCheck Advisory on Wekan.

Workarounds

• Implement network-level access controls to restrict Integration REST API access to trusted administrative IPs
• Deploy a reverse proxy or WAF to filter and block unauthorized requests to integration endpoints
• Review and reduce the number of users with board member access to minimize attack surface
• Enable additional authentication factors for administrative operations where supported

# Example: Nginx reverse proxy rule to restrict integration API access
location ~ ^/api/boards/.*/integrations {
    # Allow only admin IP ranges
    allow 10.0.1.0/24;
    deny all;
    proxy_pass http://wekan_backend;
}