{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-66808",
        "tracking": {
            "current_release_date": "2026-08-11T20:12:37.379172Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-66808",
            "initial_release_date": "2026-08-07T00:27:39.028713Z",
            "revision_history": [
                {
                    "date": "2026-08-07T00:27:39.028713Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| Product Identifiers created (1).| Product Remediations created (2).| References created (3).| CWES updated (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-08-07T00:27:46.822971Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-08-11T06:14:36.300327Z",
                    "number": "3",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T17:42:24.995343Z",
                    "number": "4",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-08-11T17:42:26.304377Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T17:45:08.659593Z",
                    "number": "6",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-08-11T17:45:10.298381Z",
                    "number": "7",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T18:28:44.492894Z",
                    "number": "8",
                    "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| Product Threats created (6).| Product Remediations created (5).| CWES updated (1).| Exploitable created."
                },
                {
                    "date": "2026-08-11T18:28:51.501785Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T18:38:54.179835Z",
                    "number": "10",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-08-11T19:05:29.215975Z",
                    "number": "11",
                    "summary": "Source connected.| CVE status created. (valid)| News created (1)."
                },
                {
                    "date": "2026-08-11T19:06:07.204003Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T20:11:55.080325Z",
                    "number": "13",
                    "summary": "Source connected.| CVE status created. (valid)"
                }
            ],
            "status": "interim",
            "version": "13"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:microsoft/*",
                                        "product": {
                                            "name": "vers:microsoft/*",
                                            "product_id": "CSAFPID-5137201",
                                            "product_identification_helper": {
                                                "cpe": "cpe:2.3:a:microsoft:sharepoint_server_2016:*:*:*:*:enterprise:*:*:*"
                                            }
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "Microsoft SharePoint Enterprise Server 2016"
                            },
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:microsoft/*",
                                        "product": {
                                            "name": "vers:microsoft/*",
                                            "product_id": "CSAFPID-5137202",
                                            "product_identification_helper": {
                                                "cpe": "cpe:2.3:a:microsoft:sharepoint_server_2019:*:*:*:*:*:*:*:*"
                                            }
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "Microsoft SharePoint Server 2019"
                            },
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:microsoft/unknown",
                                        "product": {
                                            "name": "vers:microsoft/unknown",
                                            "product_id": "CSAFPID-1429583",
                                            "product_identification_helper": {
                                                "cpe": "cpe:2.3:a:microsoft:sharepoint_server:-:*:*:*:subscription:*:*:*"
                                            }
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "Microsoft SharePoint Server Subscription Edition"
                            }
                        ],
                        "category": "product_family",
                        "name": "Microsoft Office"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/16.0.0|<16.0.5565.1001",
                                "product": {
                                    "name": "vers:unknown/16.0.0|<16.0.5565.1001",
                                    "product_id": "CSAFPID-8962583"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Microsoft SharePoint Enterprise Server 2016"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/16.0.0|<16.0.10417.20198",
                                "product": {
                                    "name": "vers:unknown/16.0.0|<16.0.10417.20198",
                                    "product_id": "CSAFPID-8962584"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Microsoft SharePoint Server 2019"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/16.0.0|<16.0.19725.20522",
                                "product": {
                                    "name": "vers:unknown/16.0.0|<16.0.19725.20522",
                                    "product_id": "CSAFPID-8962585"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Microsoft SharePoint Server Subscription Edition"
                    }
                ],
                "category": "vendor",
                "name": "Microsoft"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:rpm/unknown",
                                "product": {
                                    "name": "vers:rpm/unknown",
                                    "product_id": "CSAFPID-1441056",
                                    "product_identification_helper": {
                                        "cpe": "cpe:/a:redhat:multicluster_engine"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Multicluster Engine for Kubernetes"
                    },
                    {
                        "branches": [
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:rpm/unknown",
                                        "product": {
                                            "name": "vers:rpm/unknown",
                                            "product_id": "CSAFPID-2552004"
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "hypershift-addon-rhel9-operator"
                            }
                        ],
                        "category": "product_family",
                        "name": "Multicluster Engine for Kubernetes"
                    }
                ],
                "category": "vendor",
                "name": "Red Hat"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-66808",
            "cwe": {
                "id": "CWE-88",
                "name": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "A flaw was found in hypershift-addon-operator. A hub-cluster administrator with write access to the hypershift-operator-install-flags ConfigMap can inject malicious command-line arguments into the privileged install Job. This vulnerability, known as argument injection, allows the attacker to pull arbitrary container images and gain full administrative control (cluster-admin code execution) on managed spoke clusters.\nThis Important flaw in Multicluster Engine for Kubernetes allows a hub-cluster namespace administrator with write access to the `hypershift-operator-install-flags` ConfigMap to inject arbitrary command-line arguments into a privileged install Job. This enables privilege escalation to cluster-admin on managed spoke clusters, bypassing security boundaries within the multi-cluster environment.",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-66808.json"
                },
                {
                    "category": "description",
                    "text": "Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/66xxx/CVE-2026-66808.json"
                },
                {
                    "category": "description",
                    "text": "Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-66808"
                },
                {
                    "category": "description",
                    "text": "<p>Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.</p>\n",
                    "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Aug"
                },
                {
                    "category": "other",
                    "text": "5.0",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "There is news data available from source Bleepingcomputer, VENDOR FIX as product remediation category, IMPACT as product threat category",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "There is cwe data available from source Nvd, There is product_remediation data available from source Redhat",
                    "title": "NCSC Score top decreasing factors"
                },
                {
                    "category": "details",
                    "text": "Severity: 3\n",
                    "title": "Vendor assessment"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-1441056",
                    "CSAFPID-2552004",
                    "CSAFPID-8962583",
                    "CSAFPID-8962584",
                    "CSAFPID-8962585",
                    "CSAFPID-1429583",
                    "CSAFPID-5137201",
                    "CSAFPID-5137202"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-66808.json"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/66xxx/CVE-2026-66808.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-66808"
                },
                {
                    "category": "external",
                    "summary": "Source - microsoft",
                    "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Aug"
                },
                {
                    "category": "external",
                    "summary": "Source - bleepingcomputer",
                    "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-august-2026-patch-tuesday-fixes-400-flaws-3-zero-days/"
                },
                {
                    "category": "external",
                    "summary": "Source - ncscclear",
                    "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0286"
                },
                {
                    "category": "external",
                    "summary": "News - bleepingcomputer",
                    "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-august-2026-patch-tuesday-fixes-400-flaws-3-zero-days/"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-66808"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66808"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://github.com/stolostron/hypershift-addon-operator/pull/766"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66808"
                }
            ],
            "remediations": [
                {
                    "category": "mitigation",
                    "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
                    "product_ids": [
                        "CSAFPID-1441056",
                        "CSAFPID-2552004"
                    ]
                },
                {
                    "category": "vendor_fix",
                    "details": "5002893",
                    "product_ids": [
                        "CSAFPID-1429583"
                    ],
                    "url": "https://www.microsoft.com/en-us/download/details.aspx?id=108767"
                },
                {
                    "category": "vendor_fix",
                    "details": "5002905",
                    "product_ids": [
                        "CSAFPID-5137201"
                    ],
                    "url": "https://www.microsoft.com/en-us/download/details.aspx?id=108758"
                },
                {
                    "category": "vendor_fix",
                    "details": "5002906",
                    "product_ids": [
                        "CSAFPID-5137201"
                    ],
                    "url": "https://www.microsoft.com/en-us/download/details.aspx?id=108776"
                },
                {
                    "category": "vendor_fix",
                    "details": "5002894",
                    "product_ids": [
                        "CSAFPID-5137202"
                    ],
                    "url": "https://www.microsoft.com/en-us/download/details.aspx?id=108774"
                },
                {
                    "category": "vendor_fix",
                    "details": "5002896",
                    "product_ids": [
                        "CSAFPID-5137202"
                    ],
                    "url": "https://www.microsoft.com/en-us/download/details.aspx?id=108773"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "products": [
                        "CSAFPID-1429583",
                        "CSAFPID-1441056",
                        "CSAFPID-2552004",
                        "CSAFPID-5137201",
                        "CSAFPID-5137202",
                        "CSAFPID-8962583",
                        "CSAFPID-8962584",
                        "CSAFPID-8962585"
                    ]
                }
            ],
            "threats": [
                {
                    "category": "exploit_status",
                    "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely",
                    "product_ids": [
                        "CSAFPID-1429583",
                        "CSAFPID-5137201",
                        "CSAFPID-5137202"
                    ]
                },
                {
                    "category": "impact",
                    "details": "Remote Code Execution",
                    "product_ids": [
                        "CSAFPID-1429583",
                        "CSAFPID-5137201",
                        "CSAFPID-5137202"
                    ]
                },
                {
                    "category": "exploit_status",
                    "details": "exploited"
                }
            ],
            "title": "CVE-2026-66808"
        }
    ]
}