# CVE-2026-56164

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

- Page: https://www.vulneraibility.com/cve/CVE-2026-56164
- CVSS: 5.3
- Known exploited: yes, in CISA KEV since 2026-07-14; CISA due date 2026-07-17
- EPSS: 1.01%
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2026-07-15)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2026-07-14)
- Weakness: CWE-306
- Published: 2026-07-14

## Affected versions

- Microsoft Microsoft SharePoint Enterprise Server 2016: affected >= 16.0.0 and < 16.0.5561.1001
- Microsoft Microsoft SharePoint Server 2019: affected >= 16.0.0 and < 16.0.10417.20175
- Microsoft Microsoft SharePoint Server Subscription Edition: affected >= 16.0.0 and < 16.0.19725.20434

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.