How severe is CVE-2026-56164?

CVE-2026-56164 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-56164 being actively exploited?

Yes. CVE-2026-56164 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-07-14, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-56164?

CVE-2026-56164 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-56164?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-56164 published?

CVE-2026-56164 was published on 2026-07-14.

CVE-2026-56164

CVE-2026-56164 is a medium-severity vulnerability in Microsoft Sharepoint Server with a CVSS 3.x base score of 5.3. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-07-14). The underlying weakness is classified as CWE-306.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 22% (98th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-07-14)
Weakness: CWE-306
Affected product: Microsoft Sharepoint Server
Published: 2026-07-14
Last modified: 2026-07-14

Description

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

Frequently asked questions

What is CVE-2026-56164?: Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
How severe is CVE-2026-56164?: CVE-2026-56164 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-56164 being actively exploited?: Yes. CVE-2026-56164 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-07-14, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-56164?: CVE-2026-56164 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-56164?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-56164 published?: CVE-2026-56164 was published on 2026-07-14.

References

Affected products (3)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

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