CVE-2026-1897: WeKan Auth Bypass Vulnerability

CVE-2026-1897 Overview

A missing authorization vulnerability has been identified in WeKan, the open-source kanban board application. This security flaw exists in the Position-History Tracking component, specifically within the server/methods/positionHistory.js file. The vulnerability allows remote attackers to access functionality without proper authorization checks, potentially exposing sensitive position history data to unauthorized users.

Critical Impact

Remote attackers with low privileges can exploit missing authorization controls to access position history data without proper permission verification, potentially leading to information disclosure.

Affected Products

• WeKan versions up to 8.20
• WeKan Position-History Tracking component
• WeKan installations using server/methods/positionHistory.js

Discovery Timeline

• February 5, 2026 - CVE-2026-1897 published to NVD
• February 5, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1897

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), which occurs when a software component does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of WeKan's Position-History Tracking feature, the application fails to validate whether the requesting user has appropriate permissions before processing requests to the positionHistory.js server methods.

The attack can be performed remotely over the network by authenticated users with low privileges. An attacker who has basic access to the WeKan application can potentially access position history data belonging to boards or cards they should not have visibility into. This could expose workflow patterns, card movement history, and organizational processes that may be considered sensitive.

Root Cause

The root cause lies in the server/methods/positionHistory.js file where server-side methods handling position history requests do not implement proper authorization checks. The affected functionality processes requests without verifying that the requesting user has the necessary permissions to access the requested position history data.

Attack Vector

The vulnerability is exploitable remotely over the network. An authenticated attacker with minimal privileges can craft requests to the position history endpoints without proper authorization verification. The attack requires network access to the WeKan instance and valid user credentials, but does not require any user interaction or special conditions beyond basic authentication.

The exploitation flow involves:

1. Attacker authenticates to the WeKan application with low-privilege credentials
2. Attacker sends requests to position history methods
3. Server processes requests without checking authorization
4. Position history data is returned to the unauthorized user

Detection Methods for CVE-2026-1897

Indicators of Compromise

• Unusual access patterns to position history endpoints from users who should not have access to specific boards
• Elevated API request volumes to positionHistory.js methods from individual user accounts
• Access logs showing position history queries for boards where the requesting user is not a member

Detection Strategies

• Monitor WeKan application logs for access to position history methods by users without board membership
• Implement anomaly detection for users accessing position history data across multiple boards they are not assigned to
• Review audit logs for patterns of systematic enumeration of position history data

Monitoring Recommendations

• Enable verbose logging for server method calls in WeKan to capture position history access attempts
• Configure alerts for repeated unauthorized access attempts to board-specific resources
• Implement user behavior analytics to detect unusual data access patterns

How to Mitigate CVE-2026-1897

Immediate Actions Required

• Upgrade WeKan to version 8.21 or later immediately
• Review access logs for evidence of unauthorized position history access
• Audit user permissions and remove unnecessary accounts with access to the WeKan instance
• Consider temporarily restricting network access to the WeKan application until the patch is applied

Patch Information

The vulnerability has been addressed in WeKan version 8.21. The fix is identified by commit 55576ec17722db094835470b386162c9a662fb60. Organizations running affected versions should upgrade to version 8.21 or later as soon as possible. The patch is available through the GitHub Wekan Release v8.21 and the specific fix can be reviewed in the GitHub Commit Details.

Workarounds

• Restrict network access to the WeKan application using firewall rules to limit exposure to trusted networks only
• Implement additional access controls at the reverse proxy or load balancer level to restrict access to sensitive endpoints
• Review and minimize user accounts with access to the WeKan instance until the patch can be applied
• Consider disabling position history tracking functionality if it is not critical to operations

# Example: Restrict WeKan access using iptables (adjust IP ranges as needed)
# Allow only trusted network ranges to access WeKan
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP