CVE-2026-33678
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.27% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-639
- Affected
- vikunja/vikunja
- Source
- security-advisories@github.com
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2Exploit, Vendor Advisory
- https://vikunja.io/changelog/vikunja-v2.2.2-was-releasedRelease Notes
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.