Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33335Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal

Medium 6.4

In plain English

A medium-severity security flaw in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 4.0)6.4Medium

Exploit odds (30 days)0.3%top 82.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	>= 0.21.0, < 2.2.0

Weakness: CWE-939 · Vector: 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

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf x_refsource_CONFIRM
https://vikunja.io/changelog/vikunja-v2.2.0-was-released x_refsource_MISC