Vikunja has Missing Authorization on CalDAV Task Read

{
  "id": "dc96b1ebcb50fe39b5c1b63bff3a378b1d32e940c8ea9ae8699af572c4a65280",
  "url": "https://osv.dev/vulnerability/CVE-2026-35598",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vikunja has Missing Authorization on CalDAV Task Read",
    "summary": "Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.",
    "evidence": "osv:CVE-2026-35598",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35598",
      "aliases": [
        "CVE-2026-35598",
        "GHSA-48ch-p4gq-x46x",
        "GO-2026-5114"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-vikunja/vikunja",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "28b537837f9808dc106c9058b5829c65759fddf2"
                },
                {
                  "fixed": "879462d717351fe5d276ddec5246bdec31b41661"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "879462d717351fe5d276ddec5246bdec31b41661"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "28b537837f9808dc106c9058b5829c65759fddf2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.3.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "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",
            "v0.20.4",
            "v0.20.3",
            "v0.20.1",
            "v0.20.0",
            "v0.19.2",
            "v0.19.1",
            "v0.19.0",
            "v0.18.1",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13",
            "v0.12",
            "v0.11",
            "v0.10",
            "v0.9",
            "v0.8",
            "v0.7",
            "v0.6",
            "v0.5",
            "v0.4",
            "v0.3",
            "v0.2",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35598.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.264348721Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35598.json",
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35598",
        "https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661",
        "https://github.com/go-vikunja/vikunja/pull/2579"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35598.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35598",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509836,
  "published_at": "2026-04-10T16:04:32.083+00:00"
}