CVE-2026-1896 Overview
A vulnerability has been identified in WeKan, an open-source kanban board application, affecting versions up to 8.20. The vulnerability exists in the ComprehensiveBoardMigration function within the server/migrations/comprehensiveBoardMigration.js file of the Migration Operation Handler component. Through manipulation of the boardId argument, attackers can bypass access controls, potentially gaining unauthorized access to board data and functionality.
Critical Impact
Authenticated attackers can exploit improper access controls to access, modify, or delete board data they should not have permissions to interact with, compromising data confidentiality and integrity within affected WeKan deployments.
Affected Products
- WeKan versions up to and including 8.20
- WeKan Migration Operation Handler component
- WeKan server/migrations/comprehensiveBoardMigration.js file
Discovery Timeline
- February 5, 2026 - CVE-2026-1896 published to NVD
- February 5, 2026 - Last updated in NVD database
Technical Details for CVE-2026-1896
Vulnerability Analysis
This vulnerability is classified as CWE-266 (Incorrect Privilege Assignment), indicating that the application fails to properly validate user permissions when processing board migration operations. The ComprehensiveBoardMigration function does not adequately verify whether the requesting user has legitimate access to the board specified by the boardId parameter before performing migration operations.
The vulnerability can be exploited remotely over the network by authenticated users with low privileges. While successful exploitation allows attackers to access and manipulate board data beyond their authorized scope, the impact is limited to the application layer without affecting the underlying system.
Root Cause
The root cause lies in insufficient access control validation within the migration operation handler. When the ComprehensiveBoardMigration function processes migration requests, it accepts the boardId argument without properly verifying that the requesting user has appropriate permissions for the specified board. This allows authenticated users to reference and interact with boards they should not have access to by manipulating the boardId parameter.
Attack Vector
The attack can be carried out remotely by an authenticated user with low-level privileges. The attacker manipulates the boardId parameter in requests to the migration operation handler, referencing boards they do not own or have legitimate access to. Due to the missing authorization checks in the ComprehensiveBoardMigration function, the system processes these requests without validating the user's relationship to the specified board.
The vulnerability requires network access to the WeKan application and valid authentication credentials, but no user interaction is needed for exploitation. The attack complexity is low as it simply involves parameter manipulation in API requests.
Detection Methods for CVE-2026-1896
Indicators of Compromise
- Unexpected access patterns to board migration endpoints from users without board ownership
- Log entries showing migration operations performed on boards by non-owner users
- Anomalous boardId values in migration requests that don't match the authenticated user's accessible boards
- Increased API calls to the migration handler from individual user accounts
Detection Strategies
- Monitor application logs for migration operations where the user ID doesn't match board ownership records
- Implement alerting on unusual patterns of board access across multiple boards by single users
- Review access logs for requests to server/migrations/comprehensiveBoardMigration.js endpoints
- Deploy Web Application Firewall (WAF) rules to detect parameter tampering in migration requests
Monitoring Recommendations
- Enable detailed logging for all migration operation handler activities
- Set up alerts for access attempts to boards where the user lacks explicit permissions
- Monitor for bulk or automated requests to migration endpoints
- Implement audit trails for all board data access and modifications
How to Mitigate CVE-2026-1896
Immediate Actions Required
- Upgrade WeKan to version 8.21 or later immediately
- Review recent migration operation logs for signs of unauthorized access
- Audit user permissions and board access patterns for anomalies
- Consider temporarily restricting access to migration functionality until patched
Patch Information
WeKan has addressed this vulnerability in version 8.21. The fix is contained in commit cc35dafef57ef6e44a514a523f9a8d891e74ad8f. Organizations running affected versions should upgrade to the patched release as the primary remediation strategy. The patch details are available at the GitHub Wekan Commit Details page, and the fixed release can be obtained from the GitHub Wekan Release v8.21 page.
Workarounds
- Implement network-level access controls to limit who can reach the WeKan application
- Use a reverse proxy to add additional authorization checks on migration endpoints
- Restrict user account creation and limit the number of authenticated users with access to the system
- Consider disabling migration functionality if not actively needed until the patch can be applied
# Example: Upgrade WeKan to patched version
# Pull the latest WeKan release
git clone https://github.com/wekan/wekan.git
cd wekan
git checkout v8.21
# Alternatively, update via package manager or container
docker pull wekanteam/wekan:v8.21
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
