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CVE-2026-56164

Microsoft SharePoint Server Missing Authentication for Critical Function

5.3 MEDIUMActively exploited (CISA KEV)EPSS 1.01%
  1. Published14 Jul 2026
  2. Added to CISA KEV14 Jul 2026
  3. Remediation due17 Jul 2026
Actively exploited (CISA KEV)

Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.

Added to KEV: 14 Jul 2026Federal remediation due: 17 Jul 2026

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

Microsoft SharePoint Server2016 · 2019 · < 16.0.19725.20434

Remediation

Fixed in
Microsoft SharePoint Server≥ 16.0.19725.20434

References

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Frequently asked

Is CVE-2026-56164 being actively exploited?

Yes. CVE-2026-56164 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 14 Jul 2026.

How severe is CVE-2026-56164?

CVE-2026-56164 has a CVSS 3.1 base score of 5.3, rated medium. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-56164?

Affected products include Microsoft SharePoint Server.

How do I fix CVE-2026-56164?

Upgrade affected software to a fixed version, for example Microsoft SharePoint Server 16.0.19725.20434 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-56164 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.