{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Maximilian Hildebrand"
        ],
        "organization": "G DATA Advanced Analytics",
        "summary": "reported this vulnerability to CISA"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.cisa.gov/news-events/news/traffic-light-protocol-tlp-definitions-and-usage"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy \u0026 Use policy (https://www.cisa.gov/privacy-policy).",
        "title": "Legal Notice and Terms of Use"
      },
      {
        "category": "summary",
        "text": "Successful exploitation of this vulnerability could allow an attacker to take control of the victim\u0027s browser.",
        "title": "Advisory Summary"
      },
      {
        "category": "other",
        "text": "Commercial Facilities, Communications, Financial Services, Food and Agriculture, Government Services and Facilities, Healthcare and Public Health, Information Technology",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Austria, China, France, Germany, United Arab Emirates",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Germany",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Locate control system networks and remote devices behind firewalls and isolating them from business networks.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA also recommends users take the following measures to protect themselves from social engineering attacks:",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Do not click web links or open attachments in unsolicited email messages.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.",
        "title": "Recommended Practices"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "central@cisa.dhs.gov",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-26-139-05 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-139-05.json"
      },
      {
        "category": "self",
        "summary": "ICSA Advisory ICSA-26-139-05 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-139-05"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/topics/industrial-control-systems"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/sites/default/files/publications/emailscams0905.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ncas/tips/ST04-014"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/secure-our-world/teach-employees-avoid-phishing"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/news-events/news/avoiding-social-engineering-and-phishing-attacks"
      }
    ],
    "title": "Kieback \u0026 Peter DDC Building Controllers",
    "tracking": {
      "current_release_date": "2026-05-19T06:00:00.000000Z",
      "generator": {
        "date": "2026-05-18T17:01:43.972624Z",
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-26-139-05",
      "initial_release_date": "2026-05-19T06:00:00.000000Z",
      "revision_history": [
        {
          "date": "2026-05-19T06:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "Initial Publication"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.12.14",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4002: \u003c=1.12.14",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4002"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.12.14",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4100: \u003c=1.12.14",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4100"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.12.14",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4200: \u003c=1.12.14",
                  "product_id": "CSAFPID-0003"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4200"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.12.14",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4200-L: \u003c=1.12.14",
                  "product_id": "CSAFPID-0004"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4200-L"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.12.14",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4400: \u003c=1.12.14",
                  "product_id": "CSAFPID-0005"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4400"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.23.4",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4002e: \u003c=1.23.4",
                  "product_id": "CSAFPID-0006"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4002e"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.23.4",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4200e: \u003c=1.23.4",
                  "product_id": "CSAFPID-0007"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4200e"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.23.4",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4400e: \u003c=1.23.4",
                  "product_id": "CSAFPID-0008"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4400e"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.23.4",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4020e: \u003c=1.23.4",
                  "product_id": "CSAFPID-0009"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4020e"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.23.4",
                "product": {
                  "name": "Kieback \u0026 Peter DDC4040e: \u003c=1.23.4",
                  "product_id": "CSAFPID-0010"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC4040e"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c=1.24.1",
                "product": {
                  "name": "Kieback \u0026 Peter DDC520: \u003c=1.24.1",
                  "product_id": "CSAFPID-0011"
                }
              }
            ],
            "category": "product_name",
            "name": "DDC520"
          }
        ],
        "category": "vendor",
        "name": "Kieback \u0026 Peter"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-4293",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The affected products are vulnerable to cross-site scripting (XSS), enabling JavaScript to be executed by the victim\u0027s browser, which allows the attacker to control the browser.",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/2026-05-18T06:00:00.000000Z",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006",
          "CSAFPID-0007",
          "CSAFPID-0008",
          "CSAFPID-0009",
          "CSAFPID-0010",
          "CSAFPID-0011"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "cwe.mitre.org",
          "url": "https://cwe.mitre.org/data/definitions/79.html"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-4293"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Kieback \u0026 Peter DDC Building Controllers are developed and designed for use in closed building automation networks. The system is protected by a multi-level perimeter against attacks, especially from outside, by dividing it into operational technology (OT) zones with firewalls. Building automation systems (BA systems) in general should not be directly accessible from untrusted networks, especially from the Internet, but should be protected by consistently applying the defense-in-depth strategy. This concept is supported by organizational measures in the building as part of a safety management system. In order to achieve safety, measures are required at all levels.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009",
            "CSAFPID-0010",
            "CSAFPID-0011"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "The DDC4002, DDC4100, DDC4200, DDC4200-L and DDC4400 controllers are end-of-maintenance, therefore the recommendations for these devices are as follows: These devices must be operated in a strictly separate OT environment.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "The DDC4002, DDC4100, DDC4200, DDC4200-L and DDC4400 controllers are end-of-maintenance, therefore the recommendations for these devices are as follows: Only trusted individuals should be granted network access to the DDC web portal.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "The DDC4002, DDC4100, DDC4200, DDC4200-L and DDC4400 controllers are end-of-maintenance, therefore the recommendations for these devices are as follows: Access to the web portal should be disabled in the device configuration if not required.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "The DDC4002, DDC4100, DDC4200, DDC4200-L and DDC4400 controllers are end-of-maintenance, therefore the recommendations for these devices are as follows: Users should be informed that only links from trusted sources should be used to access the web service.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "For the DDC520, DDC4002e, DDC4200e, DDC4400e, DDC4020e, and DDC4040e controllers, Kieback \u0026 Peter recommends the following safety measure: Restrict network access to the device",
          "product_ids": [
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009",
            "CSAFPID-0010",
            "CSAFPID-0011"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "For the DDC520, DDC4002e, DDC4200e, DDC4400e, DDC4020e, and DDC4040e controllers, Kieback \u0026 Peter recommends the following safety measure: Do not directly connect the device to the Internet",
          "product_ids": [
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009",
            "CSAFPID-0010",
            "CSAFPID-0011"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC4002e -\u003e Update to version 1.23.5 or newer",
          "product_ids": [
            "CSAFPID-0006"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC4200e -\u003e Update to version 1.23.5 or newer",
          "product_ids": [
            "CSAFPID-0007"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC4400e -\u003e Update to version 1.23.5 or newer",
          "product_ids": [
            "CSAFPID-0008"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC4020e -\u003e Update to version 1.23.5 or newer",
          "product_ids": [
            "CSAFPID-0009"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC4040e -\u003e Update to version 1.23.5 or newer",
          "product_ids": [
            "CSAFPID-0010"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the firmware to the latest available version: DDC520   -\u003e Update to version 1.24.2 or newer",
          "product_ids": [
            "CSAFPID-0011"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009",
            "CSAFPID-0010",
            "CSAFPID-0011"
          ]
        }
      ]
    }
  ]
}