{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.57.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "976d38e8a4485a1c923ee7b5841849e91a06e849"
            },
            {
              "fixed": "09b7adaa062d4843afa882fc1343800467a6125d"
            }
          ],
          "repo": "https://github.com/kimai/kimai",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3q6q-26vg-v97x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639",
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52821.json"
  },
  "details": "Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/activity/create/{project} and /en/admin/project/create/{customer} require only the generic create_activity or create_project capability and do not verify edit access to the supplied Project or Customer object. A user who knows a valid project.id or customer identifier can use the preset-parent creation logic in src/Controller/ActivityController.php or src/Controller/ProjectController.php to persist a new child business object under an unauthorized parent, polluting project or customer configuration and influencing later time-entry, rate, reporting, and billing behavior. This issue is fixed in version 2.57.0.",
  "id": "CVE-2026-52821",
  "modified": "2026-09-17T03:30:32.444612689Z",
  "published": "2026-09-15T10:38:16.963Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kimai/kimai/releases/tag/2.57.0"
    },
    {
      "type": "WEB",
      "url": "https://www.kimai.org/en/security/ghsa-3q6q-26vg-v97x"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52821.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-3q6q-26vg-v97x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52821"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kimai/kimai/pull/5929"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kimai: Improper Authorization in Kimai Activity Creation with Preset Project Allows Creation Under Unauthorized Projects"
}