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    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited. (TLPv2: TLP:CLEAR)",
      "tlp": {
        "label": "WHITE"
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    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "SIMATIC HMI Unified Comfort Panels before V21.0 are affected by a vulnerability that allows an unauthenticated attacker to access the web browser via the help link.\nThis vulnerability allows an attacker to access the web browser through the Control Panel if it is not protected by the corresponding security mechanisms. This opens the possibility for the attacker to find backdoors, which might lead to unwanted misconfigurations.\n\nSiemens has released new versions for the affected products and recommends to update to the latest versions.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "productcert@siemens.com",
      "name": "Siemens ProductCERT",
      "namespace": "https://www.siemens.com"
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    "references": [
      {
        "category": "self",
        "summary": "SSA-387223: Unauthenticated Control Panel Escape Vulnerability on SIMATIC HMI Unified Comfort before V21.0 - HTML Version",
        "url": "https://cert-portal.siemens.com/productcert/html/ssa-387223.html"
      },
      {
        "category": "self",
        "summary": "SSA-387223: Unauthenticated Control Panel Escape Vulnerability on SIMATIC HMI Unified Comfort before V21.0 - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-387223.json"
      }
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    "title": "SSA-387223: Unauthenticated Control Panel Escape Vulnerability on SIMATIC HMI Unified Comfort before V21.0",
    "tracking": {
      "current_release_date": "2026-05-12T00:00:00.000Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
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      "id": "SSA-387223",
      "initial_release_date": "2026-05-12T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-12T00:00:00.000Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
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      "version": "1"
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        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-27662",
      "cwe": {
        "id": "CWE-1188",
        "name": "Initialization of a Resource with an Insecure Default"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Affected devices do not properly restrict access to the web browser via the Control Panel when no corresponding security mechanisms are in place.\r\nThis could allow an unauthenticated attacker to gain unauthorized access to the web browser, potentially enabling the discovery of backdoors, performing unauthorized actions, or exploiting misconfigurations that may lead to further system compromise.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
          "11",
          "12",
          "13",
          "14",
          "15",
          "16",
          "17",
          "18",
          "19",
          "20",
          "21",
          "22",
          "23",
          "24",
          "25",
          "26",
          "27",
          "28",
          "29",
          "30",
          "31",
          "32",
          "33",
          "34",
          "35",
          "36",
          "37",
          "38",
          "39",
          "40",
          "41",
          "42",
          "43",
          "44",
          "45",
          "46",
          "47",
          "48",
          "49",
          "50",
          "51"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Compliance with the security guidelines is strongly recommended (specially chapter \u201c3.2 Ending HMI runtime\u201d, \u201c3.4.1 Enable access protection for the Control Panel\u201d and \u201c3.4.2 Changing runtime autostart) https://support.industry.siemens.com/cs/ww/en/view/109481300",
          "product_ids": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19",
            "20",
            "21",
            "22",
            "23",
            "24",
            "25",
            "26",
            "27",
            "28",
            "29",
            "30",
            "31",
            "32",
            "33",
            "34",
            "35",
            "36",
            "37",
            "38",
            "39",
            "40",
            "41",
            "42",
            "43",
            "44",
            "45",
            "46",
            "47",
            "48",
            "49",
            "50",
            "51"
          ]
        },
        {
          "category": "mitigation",
          "details": "Disable the taskbar which can be configured in the Control Panel > System Properties > Taskbar.",
          "product_ids": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
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            "17",
            "18",
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            "43",
            "44",
            "45",
            "46",
            "47",
            "48",
            "49",
            "50",
            "51"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V21 or later version",
          "product_ids": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19",
            "20",
            "21",
            "22",
            "23",
            "24",
            "25",
            "26",
            "27",
            "28",
            "29",
            "30",
            "31",
            "32",
            "33",
            "34",
            "35",
            "36",
            "37",
            "38",
            "39",
            "40",
            "41",
            "42",
            "43",
            "44",
            "45",
            "46",
            "47",
            "48",
            "49",
            "50",
            "51"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109825605/"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19",
            "20",
            "21",
            "22",
            "23",
            "24",
            "25",
            "26",
            "27",
            "28",
            "29",
            "30",
            "31",
            "32",
            "33",
            "34",
            "35",
            "36",
            "37",
            "38",
            "39",
            "40",
            "41",
            "42",
            "43",
            "44",
            "45",
            "46",
            "47",
            "48",
            "49",
            "50",
            "51"
          ]
        }
      ],
      "title": "CVE-2026-27662"
    }
  ]
}