Vulnerability in Go-Vikunja Vikunja
CVE-2026-40103
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Go-Vikunja Vikunja — versions < 2.3.0
- Vikunja
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83 (Exploit, Vendor Advisory)
- github.com/go-vikunja/vikunja/pull/2584 (Issue Tracking)
- github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae (Patch)
- github.com/go-vikunja/vikunja/releases/tag/v2.3.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-40103?
- CVE-2026-40103 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under CWE-836. CVSS score: 4.3/10. Published 2026-04-10.
- How severe is CVE-2026-40103?
- Medium severity. CVSS v3 base score is 4.3 out of 10.