CVE-2026-1897 is a vulnerability identified in the open-source collaborative project management tool WeKan, specifically affecting versions 8.0 through 8.20. The issue resides in the Position-History Tracking component, within the server-side JavaScript file server/methods/positionHistory.js. The vulnerability is characterized by missing authorization checks, which means that certain remote requests can manipulate position history data without proper permission validation. This flaw allows an attacker to perform unauthorized actions remotely, without requiring user interaction or elevated privileges beyond a low-level user role. The vulnerability impacts the confidentiality and integrity of data managed by WeKan, as unauthorized users could potentially access or alter position history information, which may contain sensitive project tracking details. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the ease of exploitation (network vector, low attack complexity, no privileges required) but limited impact scope and no requirement for user interaction. The issue is resolved by upgrading to WeKan version 8.21, which includes a patch identified by commit 55576ec17722db094835470b386162c9a662fb60. No known exploits have been reported in the wild, but the vulnerability's nature warrants prompt remediation to prevent potential abuse. The vulnerability highlights the importance of rigorous authorization checks in collaborative software components that handle sensitive tracking data.

For European organizations, the vulnerability poses a risk to the confidentiality and integrity of project management data stored and processed in WeKan. Unauthorized manipulation of position history could lead to misinformation, disruption of project workflows, or exposure of sensitive operational details. This can affect organizations relying on WeKan for internal collaboration, especially in sectors such as technology, consulting, and public administration where project tracking is critical. Although the vulnerability does not directly impact availability, the potential for data tampering could undermine trust in project management processes and lead to operational inefficiencies. The remote exploitation capability increases the attack surface, particularly for organizations exposing WeKan instances to the internet or insufficiently segmented internal networks. Given the medium severity and no known active exploitation, the immediate risk is moderate but could escalate if threat actors develop exploits. Organizations with compliance obligations around data integrity and confidentiality, such as GDPR, may face regulatory scrutiny if unauthorized data manipulation occurs.

European organizations using WeKan should immediately plan and execute an upgrade to version 8.21 or later to remediate the vulnerability. Prior to upgrading, conduct an inventory of all WeKan instances, including those in development, testing, and production environments, to ensure comprehensive coverage. Restrict network access to WeKan servers by implementing strict firewall rules and network segmentation to limit exposure to untrusted networks. Employ strong authentication and authorization policies to minimize the risk of low-privilege users exploiting the vulnerability. Monitor logs and audit trails for unusual access patterns or unauthorized changes to position history data. If immediate upgrade is not feasible, consider applying temporary access controls or disabling the Position-History Tracking feature if possible. Engage with WeKan community or vendor support channels for additional guidance and verify the integrity of the patch before deployment. Finally, incorporate this vulnerability into ongoing vulnerability management and incident response plans to ensure rapid detection and remediation of any exploitation attempts.