CVE-2026-2205 is an information disclosure vulnerability found in WeKan, an open-source kanban board application widely used for project and task management. The vulnerability affects all versions up to 8.20 and is located in the Meteor Publication Handler component, specifically within the server/publications/cards.js file. This component is responsible for publishing data to clients in a Meteor-based application architecture. The flaw allows an attacker to remotely manipulate the publication handler, causing unauthorized disclosure of sensitive information that should otherwise be protected. The vulnerability does not require any authentication or user interaction, making it easier to exploit remotely. The CVSS 4.0 base score is 5.3, indicating a medium severity level, primarily due to its impact on confidentiality without affecting integrity or availability. The vulnerability can be mitigated by upgrading to WeKan version 8.21, which contains a patch (commit 0f5a9c38778ca550cbab6c5093470e1e90cb837f) that addresses the issue by correcting the publication handler's data exposure logic. No public exploits or active exploitation campaigns have been reported to date, but the vulnerability's characteristics suggest that it could be leveraged by attackers to gain unauthorized access to project data, potentially exposing sensitive business information or user data.

For European organizations, the primary impact of CVE-2026-2205 is the unauthorized disclosure of potentially sensitive project management data stored or processed within WeKan instances. This could include confidential project details, internal communications, or user information, leading to privacy violations, competitive disadvantage, or regulatory non-compliance under GDPR. Since the vulnerability allows remote exploitation without authentication, attackers could access data from outside the network perimeter, increasing risk especially for publicly accessible WeKan deployments. Although the vulnerability does not compromise system integrity or availability, the confidentiality breach alone can have significant reputational and operational consequences. Organizations in sectors with strict data protection requirements, such as finance, healthcare, and government, may face heightened risks and legal liabilities if sensitive data is exposed. The absence of known exploits reduces immediate risk but should not lead to complacency given the ease of exploitation and the widespread use of WeKan in collaborative environments.

European organizations should immediately upgrade all affected WeKan instances to version 8.21 or later to apply the official patch that resolves the information disclosure vulnerability. For environments where immediate upgrade is not feasible, organizations should restrict external access to WeKan servers by implementing network-level controls such as IP whitelisting, VPN access, or firewall rules to limit exposure. Conduct thorough audits of current WeKan deployments to identify publicly accessible instances and verify version levels. Additionally, review and tighten Meteor publication permissions and data exposure configurations to minimize unnecessary data sharing. Implement monitoring and alerting for unusual access patterns or data requests from WeKan services. Regularly back up project data and maintain incident response plans tailored to data breaches involving collaboration platforms. Finally, educate users and administrators about the risks associated with outdated software and the importance of timely patching.