CVE-2026-2207: Wekan Information Disclosure Vulnerability

CVE-2026-2207 Overview

CVE-2026-2207 is an information disclosure vulnerability affecting WeKan, an open-source kanban board application. The weakness exists in the server/publications/activities.js file within the Activity Publication Handler component, allowing remote attackers to potentially access sensitive information without proper authorization.

Critical Impact

Remote unauthenticated attackers can exploit this vulnerability to gain access to sensitive activity data through the WeKan Activity Publication Handler, potentially exposing confidential project information.

Affected Products

• WeKan versions up to and including 8.20
• wekan_project wekan (all installations prior to version 8.21)

Discovery Timeline

• February 8, 2026 - CVE-2026-2207 published to NVD
• February 11, 2026 - Last updated in NVD database

Technical Details for CVE-2026-2207

Vulnerability Analysis

This information disclosure vulnerability (CWE-200) exists within the Activity Publication Handler component of WeKan. The flaw allows remote attackers to manipulate requests to the server/publications/activities.js file, resulting in unauthorized access to activity data that should be protected. The vulnerability requires no authentication or user interaction to exploit, making it accessible to any network-based attacker who can reach the WeKan instance.

The issue stems from improper handling of data within the activity publication mechanism, which fails to adequately restrict access to sensitive activity records. When exploited, attackers can retrieve information about board activities, potentially including user actions, card modifications, and other operational data that could reveal business-sensitive information.

Root Cause

The root cause of CVE-2026-2207 is improper access control within the Activity Publication Handler. The activities.js publication does not properly validate authorization before returning activity data to requesting clients. This allows any remote user to query and receive activity information that should be restricted to authorized board members or administrators.

Attack Vector

The attack can be launched remotely over the network against any vulnerable WeKan instance. An attacker does not need authentication credentials or local access to exploit this vulnerability. By sending specially crafted requests to the WeKan server targeting the activity publication endpoint, an attacker can retrieve activity data that should be restricted.

The exploitation process involves manipulating requests to the Meteor publication system that handles activity data. Since the vulnerability exists in the server-side publication handler, all data filtering and access control decisions that fail occur on the server before data is transmitted to the client.

Detection Methods for CVE-2026-2207

Indicators of Compromise

• Unusual or high-volume requests to the WeKan activity publication endpoints
• Access logs showing requests from unauthorized IP addresses querying activity data
• Anomalous Meteor DDP (Distributed Data Protocol) subscription patterns targeting activities
• Evidence of data exfiltration in network traffic originating from the WeKan server

Detection Strategies

• Monitor server access logs for suspicious patterns accessing server/publications/activities.js related endpoints
• Implement network traffic analysis to detect unusual data flows from WeKan instances
• Deploy application-level logging to track activity publication subscription requests
• Use SentinelOne Singularity to detect and alert on abnormal process behavior associated with the WeKan application

Monitoring Recommendations

• Enable verbose logging on WeKan instances to capture all publication subscription events
• Configure alerting for any unauthorized attempts to access activity publications
• Implement rate limiting on API endpoints to detect and prevent data harvesting attempts
• Review server logs regularly for signs of reconnaissance or exploitation attempts

How to Mitigate CVE-2026-2207

Immediate Actions Required

• Upgrade WeKan to version 8.21 or later immediately
• Audit access logs for any signs of prior exploitation
• Review and restrict network access to WeKan instances using firewall rules
• Consider temporarily restricting external access to WeKan until the patch can be applied

Patch Information

The WeKan project has released version 8.21 which addresses this vulnerability. The fix is contained in commit 91a936e07d2976d4246dfe834281c3aaa87f9503. Organizations running WeKan should upgrade to version 8.21 or later to remediate this issue. The patch can be reviewed in the GitHub Commit Details and the release is available at GitHub WeKan Release v8.21.

Workarounds

• Implement network-level access controls to restrict access to WeKan instances from trusted networks only
• Use a reverse proxy with authentication to add an additional layer of access control
• Monitor and alert on unusual access patterns to the application
• Consider disabling the activity publication feature if it is not required for business operations

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