CVE-2026-33335
Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal
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.
INFO
Published Date :
March 24, 2026, 4:16 p.m.
Last Modified :
March 27, 2026, 4:58 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Vikunja Desktop Electron wrapper to version 2.2.0.
- Verify that `window.open` calls are properly validated.
- Ensure only allowed URI schemes are passed to `shell.openExternal()`.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33335.
| URL | Resource |
|---|---|
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf | Exploit Vendor Advisory |
| https://vikunja.io/changelog/vikunja-v2.2.0-was-released | Release Notes |
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33335 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33335
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33335 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33335 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* versions from (including) 0.21.0 up to (excluding) 2.2.2 Added Reference Type GitHub, Inc.: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://vikunja.io/changelog/vikunja-v2.2.0-was-released Types: Release Notes Added Reference Type CISA-ADP: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 25, 2026
Action Type Old Value New Value Added Reference https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf -
New CVE Received by [email protected]
Mar. 24, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-939 Added Reference https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf Added Reference https://vikunja.io/changelog/vikunja-v2.2.0-was-released