{
    "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-2026-66805",
        "tracking": {
            "current_release_date": "2026-08-11T20:12:30.929018Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-66805",
            "initial_release_date": "2026-08-11T00:28:21.153378Z",
            "revision_history": [
                {
                    "date": "2026-08-11T00:28:21.153378Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Identifiers created (2).| Product Remediations created (4).| References created (3).| CWES updated (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-08-11T00:28:23.405445Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-08-11T06:14:36.300327Z",
                    "number": "3",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T17:40:52.379319Z",
                    "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": "2026-08-11T17:40:53.925197Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T17:44:56.460189Z",
                    "number": "6",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-08-11T17:45:07.178180Z",
                    "number": "7",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T18:28:42.636138Z",
                    "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": "2026-08-11T18:40:57.914571Z",
                    "number": "10",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-08-11T19:05:33.213758Z",
                    "number": "11",
                    "summary": "Source connected.| CVE status created. (valid)| News created (1)."
                },
                {
                    "date": "2026-08-11T19:05:53.718153Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-08-11T20:11:55.042989Z",
                    "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": [
                            {
                                "category": "product_version_range",
                                "name": "vers:rpm/2",
                                "product": {
                                    "name": "vers:rpm/2",
                                    "product_id": "CSAFPID-1441080",
                                    "product_identification_helper": {
                                        "cpe": "cpe:/a:redhat:acm:2"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Red Hat Advanced Cluster Management for Kubernetes 2"
                    },
                    {
                        "branches": [
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:rpm/unknown",
                                        "product": {
                                            "name": "vers:rpm/unknown",
                                            "product_id": "CSAFPID-2778177"
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "console-mce-rhel9"
                            }
                        ],
                        "category": "product_family",
                        "name": "Multicluster Engine for Kubernetes"
                    },
                    {
                        "branches": [
                            {
                                "branches": [
                                    {
                                        "category": "product_version_range",
                                        "name": "vers:rpm/unknown",
                                        "product": {
                                            "name": "vers:rpm/unknown",
                                            "product_id": "CSAFPID-2109918"
                                        }
                                    }
                                ],
                                "category": "product_name",
                                "name": "console-rhel9"
                            }
                        ],
                        "category": "product_family",
                        "name": "Red Hat Advanced Cluster Management for Kubernetes 2"
                    }
                ],
                "category": "vendor",
                "name": "Red Hat"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-66805",
            "cwe": {
                "id": "CWE-79",
                "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "A flaw was found in the console component. An attacker who can write to container logs on a managed cluster can inject malicious code into the hub console user's browser session. This occurs when the user views raw pod logs, as the console does not properly escape the log content. Successful exploitation could lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the console user.\nThis is an Important flaw where an attacker with the ability to write to container logs on a managed cluster can inject malicious HTML/JavaScript. When a Red Hat Advanced Cluster Management for Kubernetes console user views these raw pod logs, the injected code executes in their browser session, potentially leading to session hijacking or credential theft. Exploitation requires both attacker control over pod output and specific user interaction.",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-66805.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-2026-66805.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-2026-66805"
                },
                {
                    "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": "4.9",
                    "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, Is related to (a version of) an uncommon product, 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-1441080",
                    "CSAFPID-2109918",
                    "CSAFPID-2778177",
                    "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-2026-66805.json"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/66xxx/CVE-2026-66805.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-66805"
                },
                {
                    "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-2026-66805"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66805"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://issues.redhat.com/browse/ACM-38692"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66805"
                }
            ],
            "remediations": [
                {
                    "category": "mitigation",
                    "details": "To reduce the risk of exploitation, ensure strict access controls are enforced on managed clusters, limiting the ability of untrusted users to deploy or modify pods and thus inject malicious content into container logs. Additionally, users should exercise caution when viewing \"Raw\" logs from potentially untrusted sources within the hub console.",
                    "product_ids": [
                        "CSAFPID-1441056",
                        "CSAFPID-1441080",
                        "CSAFPID-2109918",
                        "CSAFPID-2778177"
                    ]
                },
                {
                    "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-1441080",
                        "CSAFPID-2109918",
                        "CSAFPID-2778177",
                        "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-2026-66805"
        }
    ]
}