CVE-2026-33335

March 25, 2026, 3:41 p.m.

6.4
Medium

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.

Product(s) Impacted

Vendor Product Versions
Vikunja
  • Vikunja
  • 0.21.0-*, 2.2.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-939
Improper Authorization in Handler for Custom URL Scheme
The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a vikunja vikunja 0.21.0-* / / / / / / /
a vikunja vikunja 2.2.0 / / / / / / /

References

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

Tags

[email protected]
CWE-939
2026-03-24
CVE-2026-33335

CVSS Score

6.4 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: LOW
  • User Interaction: PASSIVE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: NONE
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: March 24, 2026, 4:16 p.m.
Last Modified: March 25, 2026, 3:41 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.