CVE-2026-2207 identifies an information disclosure vulnerability in the open-source project management tool WeKan, affecting all versions up to 8.20. The vulnerability stems from a weakness in the processing of the file located at server/publications/activities.js, part of the Activity Publication Handler component. This flaw allows an unauthenticated remote attacker to perform a manipulation—likely through crafted HTTP requests or parameters—that results in unauthorized disclosure of sensitive information. The exact nature of the leaked data is unspecified, but given the component involved, it may include activity logs or publication metadata that could reveal internal project details or user information. The vulnerability does not require any privileges or user interaction, making it easier to exploit remotely over the network. The CVSS 4.0 base score is 6.9, reflecting a medium severity level primarily due to the confidentiality impact and ease of exploitation. The issue is resolved in WeKan version 8.21, which includes a patch identified by commit 91a936e07d2976d4246dfe834281c3aaa87f9503. No evidence of active exploitation in the wild has been reported to date. Organizations relying on WeKan for collaborative project management should upgrade promptly to mitigate risks associated with this vulnerability.

For European organizations, the information disclosure vulnerability in WeKan could lead to unauthorized exposure of sensitive project management data, including activity logs, user actions, or internal communications. This exposure may facilitate further targeted attacks such as social engineering, reconnaissance for lateral movement, or intellectual property theft. Since WeKan is often used in collaborative environments, leaked information could compromise confidentiality agreements or reveal strategic plans. The lack of authentication requirements for exploitation increases the risk, especially for organizations exposing WeKan instances to the internet. While the vulnerability does not directly impact system integrity or availability, the confidentiality breach alone can have significant reputational and regulatory consequences under GDPR and other data protection laws. Organizations in sectors with strict compliance requirements or handling sensitive projects are particularly vulnerable. The medium severity rating suggests a moderate but actionable risk that should be addressed promptly to avoid escalation.

To mitigate CVE-2026-2207, European organizations should immediately upgrade all affected WeKan instances to version 8.21 or later, which contains the official patch. Network administrators should restrict external access to the server/publications/activities.js endpoint by implementing firewall rules or web application firewall (WAF) policies to limit exposure to untrusted networks. Monitoring and logging HTTP requests targeting this endpoint can help detect suspicious activity indicative of exploitation attempts. Employing network segmentation to isolate WeKan servers from critical infrastructure reduces potential lateral movement if exploitation occurs. Additionally, organizations should review access controls and audit logs for unusual access patterns or data exfiltration signs. Regular vulnerability scanning and penetration testing focused on web application endpoints can identify residual risks. Finally, educating users and administrators about the importance of timely patching and secure configuration of collaboration tools will strengthen overall security posture.