Description
Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue.
Problem types
CWE-639: Authorization Bypass Through User-Controlled Key
Product status
References
github.com/...ikunja/security/advisories/GHSA-jfmm-mjcp-8wq2
vikunja.io/changelog/vikunja-v2.2.2-was-released