{ "document": { "acknowledgments": [ { "names": [ "hamayanhamayan" ] }, { "names": [ "P1hcn" ] }, { "names": [ "waid" ] } ], "aggregate_severity": { "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Public", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en-US", "notes": [ { "category": "general", "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle", "title": "Additional Resources" }, { "category": "legal_disclaimer", "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.", "title": "Disclaimer" }, { "category": "general", "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.", "title": "Customer Action" } ], "publisher": { "category": "vendor", "contact_details": "secure@microsoft.com", "name": "Microsoft Security Response Center", "namespace": "https://msrc.microsoft.com" }, "references": [ { "category": "self", "summary": "CVE-2026-58639 Microsoft SharePoint Server Spoofing Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58639" }, { "category": "self", "summary": "CVE-2026-58639 Microsoft SharePoint Server Spoofing Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-58639.json" }, { "category": "external", "summary": "Microsoft Exploitability Index", "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1" }, { "category": "external", "summary": "Microsoft Support Lifecycle", "url": "https://support.microsoft.com/lifecycle" }, { "category": "external", "summary": "Common Vulnerability Scoring System", "url": "https://www.first.org/cvss" } ], "title": "Microsoft SharePoint Server Spoofing Vulnerability", "tracking": { "current_release_date": "2026-08-11T07:00:00.000Z", "generator": { "date": "2026-08-27T18:31:34.292Z", "engine": { "name": "MSRC Generator", "version": "1.0" } }, "id": "msrc_CVE-2026-58639", "initial_release_date": "2026-08-11T07:00:00.000Z", "revision_history": [ { "date": "2026-08-11T07:00:00.000Z", "legacy_version": "1", "number": "1", "summary": "Information published." } ], "status": "final", "version": "1" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "<16.0.5565.1001", "product": { "name": "Microsoft SharePoint Enterprise Server 2016 <16.0.5565.1001", "product_id": "3" } }, { "category": "product_version", "name": "16.0.5565.1001", "product": { "name": "Microsoft SharePoint Enterprise Server 2016 16.0.5565.1001", "product_id": "10950" } } ], "category": "product_name", "name": "Microsoft SharePoint Enterprise Server 2016" }, { "branches": [ { "category": "product_version_range", "name": "<16.0.10417.20198", "product": { "name": "Microsoft SharePoint Server 2019 <16.0.10417.20198", "product_id": "2" } }, { "category": "product_version", "name": "16.0.10417.20198", "product": { "name": "Microsoft SharePoint Server 2019 16.0.10417.20198", "product_id": "11585" } } ], "category": "product_name", "name": "Microsoft SharePoint Server 2019" }, { "branches": [ { "category": "product_version_range", "name": "<16.0.19725.20522", "product": { "name": "Microsoft SharePoint Server Subscription Edition <16.0.19725.20522", "product_id": "1" } }, { "category": "product_version", "name": "16.0.19725.20522", "product": { "name": "Microsoft SharePoint Server Subscription Edition 16.0.19725.20522", "product_id": "11961" } } ], "category": "product_name", "name": "Microsoft SharePoint Server Subscription Edition" } ], "category": "vendor", "name": "Microsoft" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-58639", "cwe": { "id": "CWE-918", "name": "Server-Side Request Forgery (SSRF)" }, "notes": [ { "category": "general", "text": "Microsoft", "title": "Assigning CNA" }, { "category": "faq", "text": "Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.", "title": "There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?" }, { "category": "faq", "text": "Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.", "title": "I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?" }, { "category": "faq", "text": "Exploiting this vulnerability could allow the disclosure of NetNTLMv2 hashes.", "title": "What type of information could be disclosed by this vulnerability?" } ], "product_status": { "fixed": [ "10950", "11585", "11961" ], "known_affected": [ "1", "2", "3" ] }, "references": [ { "category": "self", "summary": "CVE-2026-58639 Microsoft SharePoint Server Spoofing Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58639" }, { "category": "self", "summary": "CVE-2026-58639 Microsoft SharePoint Server Spoofing Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-58639.json" } ], "remediations": [ { "category": "vendor_fix", "date": "2026-08-11T07:00:00.000Z", "details": "16.0.5565.1001:Security Update:https://support.microsoft.com/help/5002905", "product_ids": [ "3" ], "url": "https://support.microsoft.com/help/5002905" }, { "category": "vendor_fix", "date": "2026-08-11T07:00:00.000Z", "details": "16.0.5565.1001:Security Update:https://support.microsoft.com/help/5002906", "product_ids": [ "3" ], "url": "https://support.microsoft.com/help/5002906" }, { "category": "vendor_fix", "date": "2026-08-11T07:00:00.000Z", "details": "16.0.10417.20198:Security Update:https://support.microsoft.com/help/5002894", "product_ids": [ "2" ], "url": "https://support.microsoft.com/help/5002894" }, { "category": "vendor_fix", "date": "2026-08-11T07:00:00.000Z", "details": "16.0.10417.20198:Security Update:https://support.microsoft.com/help/5002896", "product_ids": [ "2" ], "url": "https://support.microsoft.com/help/5002896" }, { "category": "vendor_fix", "date": "2026-08-11T07:00:00.000Z", "details": "16.0.19725.20522:Security Update:https://support.microsoft.com/help/5002893", "product_ids": [ "1" ], "url": "https://support.microsoft.com/help/5002893" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "exploitCodeMaturity": "UNPROVEN", "integrityImpact": "NONE", "privilegesRequired": "LOW", "remediationLevel": "OFFICIAL_FIX", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 5.7, "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C", "version": "3.1" }, "products": [ "1", "2", "3" ] } ], "threats": [ { "category": "impact", "details": "Spoofing" }, { "category": "exploit_status", "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely" } ], "title": "Microsoft SharePoint Server Spoofing Vulnerability" } ] }