# CVE-2026-33335

## Summary

- **CVE ID:** CVE-2026-33335
- **Severity:** MEDIUM
- **CVSS Score:** 6.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H)
- **CWE:** CWE-939
- **Published:** Mar 24, 2026
- **Last Modified:** Mar 25, 2026

## Description

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.

## Affected Products

- go-vikunja — vikunja (>= 0.21.0, < 2.2.0)

## References

- [CNA](https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf)
- [CNA](https://vikunja.io/changelog/vikunja-v2.2.0-was-released)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._