Auth bypass in Go-Vikunja Vikunja
CVE-2026-33676
Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, when the Vikunja API returns tasks, it populates the `related_tasks` field with full task objects for all related tasks without checking whether the requesting user has read permission on those tasks' projects. An authenticated user who can read a task that has cross-project relations will receive full details (title, description, due dates, priority, percent completion, project ID, etc.) of tasks in projects they have no access to. Version 2.2.1 patches the issue.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Go-Vikunja Vikunja — versions < 2.2.1
- Vikunja
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-8cmm-j6c4-rr8v (Exploit, Vendor Advisory)
- github.com/go-vikunja/vikunja/pull/2449 (Issue Tracking)
- github.com/go-vikunja/vikunja/commit/833f2aec006ac0f6643c41872e45dd79220b9174 (Patch)
- vikunja.io/changelog/vikunja-v2.2.2-was-released (Release Notes)
Frequently asked questions
- What is CVE-2026-33676?
- CVE-2026-33676 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-03-24.
- How severe is CVE-2026-33676?
- Medium severity. CVSS v3 base score is 6.5 out of 10.