Description
Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exposes share hashes to users with read access, enabling permission escalation to admin-level shares. The GetTaskAttachment endpoint performs permission checks against user-supplied task IDs but fetches attachments by sequential ID without verifying ownership, allowing attackers to download and delete all file attachments across all projects instance-wide.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Vikunja | Vikunja | < 2.2.1 | 2.2.1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | code.vikunja.io/api | < 2.2.1 | 2.2.1 | GHSA-2pv8-4c52-mf8j |
| Go | code.vikunja.io/api | all versions | — | GO-2026-4855 |