CVE-2026-1896 is a vulnerability identified in the open-source project management tool WeKan, specifically affecting all versions up to 8.20. The issue resides in the ComprehensiveBoardMigration function within the server/migrations/comprehensiveBoardMigration.js file, part of the Migration Operation Handler component. The vulnerability arises from improper access control checks on the boardId parameter, which an attacker can manipulate remotely to bypass authorization controls. This flaw enables an attacker with low privileges to potentially access or migrate boards they should not have permissions for, leading to unauthorized data exposure or modification. The vulnerability does not require user interaction and can be exploited over the network without elevated privileges, increasing its risk profile. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact on confidentiality, integrity, and availability, and the ease of exploitation due to network accessibility and lack of required user interaction. The issue is resolved in WeKan version 8.21, with the patch identified by commit cc35dafef57ef6e44a514a523f9a8d891e74ad8f. No known exploits have been reported in the wild, but the vulnerability's nature warrants prompt remediation to prevent potential misuse. WeKan is widely used by organizations for agile project management and collaboration, making this vulnerability relevant for entities relying on this software for sensitive or critical workflows.

For European organizations, this vulnerability poses a risk of unauthorized access to project boards, potentially exposing sensitive project data, intellectual property, or confidential communications. The integrity of project data could be compromised if attackers manipulate board migrations, leading to data corruption or loss. Availability may also be affected if migration operations are disrupted or abused. Organizations in sectors such as technology, finance, government, and critical infrastructure that utilize WeKan for collaborative project management are particularly at risk. The medium severity rating indicates a moderate but tangible threat, especially in environments where access controls are critical. The remote exploitability without user interaction increases the urgency for patching. Data privacy regulations in Europe, such as GDPR, may impose additional compliance risks if unauthorized data access occurs due to this vulnerability. The absence of known exploits currently reduces immediate risk but does not eliminate the potential for future attacks.

European organizations should immediately upgrade all affected WeKan instances to version 8.21 or later, which contains the official patch addressing this vulnerability. Prior to upgrading, conduct an inventory of all WeKan deployments to ensure no instances remain on vulnerable versions. Implement strict access controls and monitor migration operations for unusual activity as a compensating control until patching is complete. Review and tighten permissions related to board migration functions to limit exposure. Employ network segmentation and firewall rules to restrict access to WeKan servers only to trusted users and systems. Enable detailed logging and alerting on migration-related API calls to detect potential exploitation attempts. Regularly audit user privileges to ensure least privilege principles are enforced. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block suspicious manipulation of boardId parameters. Finally, maintain awareness of any emerging exploit reports or indicators of compromise related to this CVE.