CVE-2026-33335

Name: CVE-2026-33335
Creator: NVD / NIST
Published: 2026-03-24T16:16:33.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.4/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2026-33335 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS 4.0

6.4/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.25%

15.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-939

Affected Software

Vendor	Product	Versions
Vikunja	Vikunja	>= 0.21.0, < 2.2.2

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvfExploit, Vendor Advisory
https://vikunja.io/changelog/vikunja-v2.2.0-was-releasedRelease Notes
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvfExploit, Vendor Advisory

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33335?

How severe is CVE-2026-33335?

CVE-2026-33335 has a CVSS score of 6.4/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33335?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33335?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST