CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NCVE-2026-33678
High (8.1) in vikunja vikunja. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in code.vikunja.io/api 2.2.1.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-11-01)
- CWE
- CWE-639
- Published
- Modified
- Record from
- the NVD, synced
Affected
- vikunja:vikunja
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jfmm-mjcp-8wq2 | Go | code.vikunja.io/api | <2.2.1 | 2.2.1 |
| GO-2026-4853 | Go | code.vikunja.io/api | all versions | no fix published |