{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "17.0.0"
                  },
                  {
                    "fixed": "17.7.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "introduced": "18.0.0"
                  },
                  {
                    "fixed": "18.2.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "fixed": "b4f6cfc9d0955f9d8443e68353db4a692e91bd94"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "243e082479c777d0f585bbd2f8db571607767b22"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "release-18.2.1",
                "range": [
                  {
                    "fixed": "e573de0991515010353295f8439853960266b56e"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "release-17.7.1",
                "range": [
                  {
                    "fixed": "4b0184ad5d2a5ccfdcd1c65b6f30a6357f8606fd"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "da502e06ae836057de372c7c2ed69a1221c3d3b4"
            },
            {
              "fixed": "4b0184ad5d2a5ccfdcd1c65b6f30a6357f8606fd"
            },
            {
              "introduced": "c087ce9fb5ca60f371f08d6f5b974c24981e3414"
            },
            {
              "fixed": "e573de0991515010353295f8439853960266b56e"
            },
            {
              "fixed": "b4f6cfc9d0955f9d8443e68353db4a692e91bd94"
            },
            {
              "fixed": "243e082479c777d0f585bbd2f8db571607767b22"
            }
          ],
          "repo": "https://github.com/umbraco/umbraco-cms",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4c5q-6c64-96j7"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111624.json"
  },
  "details": "Umbraco CMS before 17.7.1 and 18.2.1 contains a missing authorization vulnerability that allows unauthenticated clients to connect to the backoffice PreviewHub and BackofficeHub SignalR hubs. Attackers can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.",
  "id": "CVE-2026-111624",
  "modified": "2026-10-24T02:30:59.811533413Z",
  "published": "2026-10-16T17:39:00.093Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111624.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-17.7.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-18.2.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-4c5q-6c64-96j7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111624"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/umbraco-cms-before-17.7.1-and-18.2.1-missing-authorization-on-signalr-hubs"
    },
    {
      "type": "FIX",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/243e082479c777d0f585bbd2f8db571607767b22"
    },
    {
      "type": "FIX",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/b4f6cfc9d0955f9d8443e68353db4a692e91bd94"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/umbraco/Umbraco-CMS"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHub.cs#L9-L11"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHubUpdater.cs#L58"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR Hubs"
}