Executive summary
Public evidence documents CVE-2026-56164. This report does not assess any organization.
Technical analysis
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
Evidence and sources
Public evidence for CVE-2026-56164 with preserved provenance.
CVE-2026-56164 Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-56164 Microsoft Patches a Record 570 Security Flaws Microsoft Corp. today released software updates to plug at least 570 security holes in its Windows operating systems and other software, almost triple the number of vulnerabilities the software giant fixed in its record-smashing Patch Tuesday release last month. Microsoft attributed the burgeoning patch counts to vulnerability discoveries aided by artificial intelligence.
IOCs
No public IOC is available.
CVEs and affected products
Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability
ATT&CK mapping
No ATT&CK mapping is available.
Detection content
Sigma rules, YARA rules, Splunk SPL, and KQL detection logic.
Threat hunting
Hypothesis-driven hunt procedures and telemetry checklist.
Remediation
Containment actions, patching notes, and credential steps.
Historical relationships
No published historical relationship is available.
Timeline and change history
Confidence and caveats
1.0
⚠️ Public CTI only; no organizational exposure is asserted.
⚠️ CVSS and EPSS metadata were not present in the retrieved evidence payload.