Blueprint Studio API authorization bypass for non-admin Home Assistant users

{
  "id": "43f26221d7f3ac2871169177824614fea123ddd61edb0ed23acea12be7a4e6a7",
  "url": "https://osv.dev/vulnerability/CVE-2026-53453",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Blueprint Studio API authorization bypass for non-admin Home Assistant users",
    "summary": "Blueprint Studio is a VS Code-like file editor for Home Assistant configuration files. Prior to 2.5.2, Blueprint Studio exposed administrator-intended backend API actions to any authenticated Home Assistant user because the backend did not consistently enforce the panel's admin-only authorization boundary. Affected surfaces included the backend API, upload API, stream routes, terminal WebSocket, Blueprint Studio WebSocket subscriptions, call_service, render_template, global_replace, file and stream access paths, upload handling, and terminal helpers. A non-admin user could invoke arbitrary Home Assistant services, expose Home Assistant state through templates, modify configuration files, access streamed or downloaded configuration content, upload files, or reach terminal-related helpers. These actions could compromise the confidentiality, integrity, and availability of the Home Assistant installation. This issue is fixed in version 2.5.2.",
    "evidence": "osv:CVE-2026-53453",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53453",
      "aliases": [
        "CVE-2026-53453",
        "GHSA-ppwq-ch6x-936g"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ha-china/blueprint-studio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "943aed0be67f3a910b0f70a3864288d5e17e55ce"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "943aed0be67f3a910b0f70a3864288d5e17e55ce"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "943aed0be67f3a910b0f70a3864288d5e17e55ce"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.5.2"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.5.1",
            "v2.5.0",
            "v2.4.8",
            "v2.4.7",
            "v2.4.6",
            "v2.4.4",
            "v2.4.3",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.0",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.5",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.6",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v.1.2.0",
            "v1.1.1",
            "V1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53453.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.091503646Z",
      "provider": "osv",
      "references": [
        "https://github.com/ha-china/blueprint-studio/releases/tag/v2.5.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53453.json",
        "https://github.com/ha-china/blueprint-studio/security/advisories/GHSA-ppwq-ch6x-936g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53453",
        "https://github.com/ha-china/blueprint-studio/commit/943aed0be67f3a910b0f70a3864288d5e17e55ce"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53453.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53453",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487388,
  "published_at": "2026-08-18T20:48:20.578+00:00"
}