{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "5.0.0"
              },
              {
                "fixed": "5.5.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "2ff182ba39ddea19fa1615bd3733f734b5e53842"
            },
            {
              "fixed": "37e206f3ed40ad3fab2e47e055ccb19e9c207dab"
            },
            {
              "fixed": "81689c7f1471beb1fa9fb9c686f6f071f8671c3c"
            }
          ],
          "repo": "https://github.com/getkirby/kirby",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-67mx-6wf2-92xp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71415.json"
  },
  "details": "Kirby is an open-source content management system. From 5.0.0 until 5.5.2, Kirby's REST API chunk upload handler in src/Api/Upload.php did not run the relevant upload authorization preflight in Kirby\\Api\\Upload::process() before Kirby\\Api\\Upload::processChunk() persisted chunk data. An authenticated user with the access.panel permission enabled but with files.create, files.replace, and user/users.update permissions disabled could submit requests with an Upload-Length header and leave unfinished chunks in site/cache/.uploads for 24 hours. Repeating this process could consume attacker-controlled temporary storage, prevent other users from uploading files, or prevent site logic from storing data, although final permission checks still prevented unauthorized files from reaching the content or site/accounts directories. This issue is fixed in version 5.5.2.",
  "id": "CVE-2026-71415",
  "modified": "2026-09-02T03:31:03.876377247Z",
  "published": "2026-08-31T20:46:02.280Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/releases/tag/5.5.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71415.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/getkirby/kirby/security/advisories/GHSA-67mx-6wf2-92xp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71415"
    },
    {
      "type": "FIX",
      "url": "https://github.com/getkirby/kirby/commit/37e206f3ed40ad3fab2e47e055ccb19e9c207dab"
    },
    {
      "type": "FIX",
      "url": "https://github.com/getkirby/kirby/pull/8296"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kirby: File upload permissions are not checked during processing of chunk data"
}