Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal

{
  "id": "3b56172429fc672efaa84c75278fa4a545603a3b9d186ed3ad1870f9c14bc980",
  "url": "https://osv.dev/vulnerability/CVE-2026-33335",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal",
    "summary": "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.",
    "evidence": "osv:CVE-2026-33335",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-33335",
      "aliases": [
        "CVE-2026-33335",
        "GHSA-6q44-85gc-cjvf"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-vikunja/vikunja",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e5cd4897d6be52c5bacb39a4ddae322921bfc0ee"
                },
                {
                  "fixed": "b365be1881641dd2791d3dff4c26ad941c13cef6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.21.0"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.21.0"
                      },
                      {
                        "fixed": "2.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.0",
            "v2.0.0",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0-rc4",
            "v1.0.0-rc3",
            "v1.0.0-rc2",
            "v1.0.0-rc1",
            "v1.0.0-rc0",
            "v0.24.1",
            "v0.23.0",
            "v0.22.1",
            "v0.22.0",
            "v0.21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33335.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.186173578Z",
      "provider": "osv",
      "references": [
        "https://vikunja.io/changelog/vikunja-v2.2.0-was-released",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33335.json",
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6q44-85gc-cjvf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33335"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-939"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33335.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33335",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492915,
  "published_at": "2026-03-24T15:07:41.46+00:00"
}