Affected: datacycle-engine dataCycle-CORE

dataCycle is a data management system for centrally storing, managing, searching, finding, and distributing data. In dataCycle-CORE, the module handling core processing and framework rules, before and including version 25.07.3, the application exposes server-side state changes through `GET` routes. Because browsers automatically send cookies on same-site top-level navigation and Rails does not apply CSRF protections to `GET`, an attacker can force a logged-in victim to modify application state by embedding a link, image, iframe, or redirect to one of these endpoints. This was confirmed on the target with a normal `Standard` account: a cross-site-style `GET` to `watch_lists/:id/add_item?thing_id=...` inserted content into a watch list with no CSRF token. Additional `GET` mutation routes exist in the codebase, including user impersonation for authorized admins and cache or translation state changes. This is patched in version 26.06.08.