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CVE-2026-30843 is an insecure direct object reference vulnerability in Wekan, an open source kanban application built with Meteor. Affected versions 8.32 and 8.33 improperly authorize operations on custom fields associated with boards. The vulnerable PUT endpoint for board custom fields validates that the authenticated user has access to the board identified in the request path, but the subsequent database update filters only on the custom field identifier and does not verify that the targeted custom field actually belongs to that board. As a result, authorization is checked against one resource while the modification is applied to another. The same authorization flaw also affects the POST, PUT, and DELETE endpoints used to manage dropdown items under custom fields. An attacker who controls or has access to any board can supply the identifier of a custom field belonging to a different board and modify it across board boundaries. The issue enables unauthorized cross-board manipulation of custom field data.
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