CVE-2026-33335 Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal
Attackers can trigger arbitrary local application execution or file access via unvalidated URLs in Vikunja Desktop, requiring a patch to secure external link handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33335?
CVE-2026-33335 is a medium-severity vulnerability in go-vikunja vikunja, published on 24 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-939
Which versions are affected by CVE-2026-33335?
It affects 1 product.
Products include Vikunja Vikunja.
How do I fix CVE-2026-33335?
No fix has been published for CVE-2026-33335 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-33335 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33335 exists.
Other vulnerabilities in go-vikunja vikunja
- CVE-2026-28268 Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse
- CVE-2026-27575 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change
- CVE-2026-25935 Vikunja Affected by XSS Via Task Preview
- CVE-2026-35595 Vikunja Affected by Privilege Escalation via Project Reparenting
- CVE-2026-33316 Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablement
Sources
Also known as GHSA-6q44-85gc-cjvf.