Ryot is a self-hosted personal tracking application. Prior to 10.5.6, the collectionContents GraphQL query implemented by collection_contents() in crates/services/collection/src/content_operations.rs accepts a caller-controlled CollectionContentsInput.collection_id and returns a collection without checking whether the authenticated user owns it, collaborates on it, or may view it. The caller's user id is used only to annotate the response, allowing any authenticated user who obtains another collection's id to read the owner's identity, collection name and description, reviews, and complete item list across the tenant boundary. This issue is fixed in version 10.5.6.