Is CVE-2026-56164 in the CISA KEV catalog?

Yes. CVE-2026-56164 is on the CISA Known Exploited Vulnerabilities list, added 2026-07-14.

What is the CVSS severity of CVE-2026-56164?

CVE-2026-56164 has a CVSS v3 base score of 5.3 (MEDIUM).

How do I fix or mitigate CVE-2026-56164?

No published fix for CVE-2026-56164 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-07-17. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2026-56164

MEDIUMCISA KEV

5.3

CVSS v3

NVD

Description

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

CWE-306Missing Authentication for Critical Function

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-07-17

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

EPSS data unavailable for this CVE.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-07-17

References

Other references2

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-14.