CVE-2026-1962 is a vulnerability identified in the open-source kanban board software WeKan, affecting all versions up to 8.20. The issue resides in an unspecified function within the server-side file server/attachmentMigration.js component, which handles attachment migration processes. The vulnerability stems from improper access control implementation, allowing remote attackers to bypass intended permission checks. This can lead to unauthorized access or manipulation of attachments during migration, potentially exposing sensitive data or corrupting attachments. The attack vector is network-based with no authentication or user interaction required, increasing exploitability. However, the impact on confidentiality, integrity, and availability is limited (low impact), as indicated by the CVSS 4.0 vector (AV:N/AC:L/AT:N/UI:N/PR:L/VC:L/VI:L/VA:L). The vulnerability was publicly disclosed on February 5, 2026, and fixed in WeKan version 8.21 via patch 053bf1dfb76ef230db162c64a6ed50ebedf67eee. No known exploits have been reported in the wild, suggesting limited active exploitation. The vulnerability highlights the importance of strict access control enforcement in components handling sensitive data migration within collaboration platforms.

For European organizations, this vulnerability could lead to unauthorized access or modification of attachments managed within WeKan, potentially exposing sensitive business or personal data. While the impact is rated medium, organizations relying heavily on WeKan for project management and document collaboration may face confidentiality breaches or data integrity issues. This could disrupt workflows, cause data leakage, or undermine trust in internal collaboration tools. Sectors such as finance, healthcare, and government, which often use open-source tools like WeKan for agile project management, may be particularly sensitive to such risks. The remote exploitability without user interaction increases the threat surface, especially for publicly accessible WeKan instances. However, the lack of known active exploits reduces immediate risk, though delayed exploitation remains possible if patches are not applied promptly.

The primary mitigation is to upgrade all affected WeKan instances to version 8.21 or later, which contains the patch addressing the improper access control flaw. Organizations should verify the integrity of their WeKan installations and ensure no unauthorized changes occurred prior to patching. Network-level protections such as restricting access to WeKan servers via VPN or firewall rules can reduce exposure. Implementing strict role-based access controls and auditing attachment migration logs can help detect suspicious activities. Regular vulnerability scanning and monitoring for unusual attachment access patterns are recommended. Additionally, organizations should maintain an incident response plan tailored to collaboration platform compromises. Since no user interaction is required for exploitation, proactive patch management is critical to prevent potential breaches.