Vulnerability in Go-Vikunja Vikunja
CVE-2026-33335
Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper passes URLs from `window.open()` calls directly to `shell.openExternal()` without any validation or protocol allowlisting. An attacker who can place a link with `target="_blank"` (or that otherwise triggers `window.open`) in user-generated content can cause the victim's operating system to open arbitrary URI schemes, invoking local applications, opening local files, or triggering custom protocol handlers. Version 2.2.0 patches the issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% 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: 0.004 · change: +0.001
Affected products
- Go-Vikunja Vikunja — versions >= 0.21.0, < 2.2.0
- Vikunja
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf (Exploit, Vendor Advisory)
- vikunja.io/changelog/vikunja-v2.2.0-was-released (Release Notes)
Frequently asked questions
- What is CVE-2026-33335?
- CVE-2026-33335 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under CWE-939. CVSS score: 8.0/10. Published 2026-03-24.
- How severe is CVE-2026-33335?
- High severity. CVSS v3 base score is 8.0 out of 10.