GHSA-W39F-H553-H2MX Vikunja: Cross-tenant task-position rows can be injected into arbitrary project views via the unvalidated project_view_id in the task position endpoint (v1 and v2)

Summary The task-position endpoint authorizes only the task side of the write: TaskPosition.CanUpdate delegates to Task.CanUpdate write access to the task's own project and the request body's projectviewid is never validated to belong to the task's project, nor is any access to that view required...