CVE-2026-56164

MEDIUM

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

CVSS v3.1 Score

5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Published: 7/14/2026Modified: 7/14/2026

Related Intelligence (5)

CRITICALZero Day

CISA urges immediate SharePoint hardening as exploits mount

The US Cybersecurity and Infrastructure Security Agency (CISA) has urged organizations to immediately secure Microsoft SharePoint deployments after warning that three vulnerabilities affecting the on-premises collaboration platform are being actively exploited. A recent advisory from the federal cybersecurity watchdog asked administrators to patch vulnerable servers, review Microsoft’s mitigation

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Patch Tuesday roundup: Microsoft fixes a monthly record 569 holes; SAP patches a critical memory corruption bug

Earlier this month Microsoft warned that, because the latest AI models can now help discover vulnerabilities, CSOs will see a higher volume of security updates every month. It wasn’t kidding. Today the company issued a record number of patches , with 59 rated as critical. And Microsoft is now recommending that customers accelerate their patching schedules to more quickly deal with critical flaws.

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CSO Online
CRITICALZero Day

Patch Tuesday - July 2026

Microsoft is publishing 622 vulnerabilities on July 2026 Patch Tuesday , including a record-breaking 416 Windows vulnerabilities. Microsoft is aware of exploitation in the wild for two of the vulnerabilities published today, both of which are listed on CISA KEV, as well as public disclosure for one other. As usual, browser vulns are not included in the Patch Tuesday count above. Rapid7 noted last

CVE-2026-55040CVE-2026-56164
Rapid7
MEDIUMVulnerability

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.

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Krebs on Security
CRITICALVulnerability

NVD CRITICAL: CVE-2026-56164 — Missing authentication for critical function in Microsoft Office SharePoint allo...

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

CVE-2026-56164
NIST NVD

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164Vendor Advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164US Government Resource