Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows deletion of other users' assets

{
  "id": "44848b4e78e6743947d905acac93a8ff071e3d7dc600f378cd491ff0622d6302",
  "url": "https://osv.dev/vulnerability/CVE-2026-50284",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows deletion of other users' assets",
    "summary": "Craft CMS is a content management system (CMS). In versions 5.0.0-RC1 through 5.9.21 and 4.0.0-RC1 through 4.17.14, theAssetsController::actionDeleteFolder() only requires the deleteAssets: permission for the target folder. It never enforces deletePeerAssets:, even though Assets::deleteFoldersByIds() cascades deletion to every descendant folder and every asset inside, regardless of the uploader's assigned privileges. A low-privilege user who has been granted folder-management rights on a shared volume can therefore destroy assets uploaded by other users (peer assets), bypassing the per-asset peer-permission check that the sibling actionDeleteAsset endpoint correctly applies. This issue has been fixed in versions 4.17.15 and 5.9.22.",
    "evidence": "osv:CVE-2026-50284",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-50284",
      "aliases": [
        "CVE-2026-50284",
        "GHSA-7h62-6v23-v8fm"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/craftcms/cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "daac7c1da2f701f2e9ddee1da1457ce61660b581"
                },
                {
                  "fixed": "609a87b01080720b8a6c33866c33018aeb32fc0a"
                },
                {
                  "fixed": "b4e08977f0c9bdf002a77f9f6d1346cd55ac0598"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.0-RC1"
                      },
                      {
                        "fixed": "4.17.15"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b4e08977f0c9bdf002a77f9f6d1346cd55ac0598"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50284.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.094491264Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50284.json",
        "https://github.com/craftcms/cms/security/advisories/GHSA-7h62-6v23-v8fm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50284",
        "https://github.com/craftcms/cms/commit/b4e08977f0c9bdf002a77f9f6d1346cd55ac0598"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "=>= 5.0.0-RC1, < 5.9.22"
                  },
                  {
                    "last_affected": "=>= 5.0.0-RC1, < 5.9.22"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50284.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-50284",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492663,
  "published_at": "2026-07-01T22:37:30.334+00:00"
}