# CVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerability

> CVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerability. CVSS 5.3 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-56164
Last updated: 2026-10-08T18:13:24Z

- Published: 2026-07-14 17:05 UTC · Updated: 2026-10-08 18:13 UTC · Assigner: microsoft
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C
- EPSS: 1.0%, 63th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-07-14, federal due date 2026-07-17, ransomware use: Unknown
- CWE: CWE-306

## Description

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

## CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

## Affected vendors and products

- Microsoft: Microsoft SharePoint Enterprise Server 2016
- Microsoft: Microsoft SharePoint Server 2019
- Microsoft: Microsoft SharePoint Server Subscription Edition

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-56164)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-56164)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-56164 · Markdown: https://rewindex.com/cve/CVE-2026-56164.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-56164 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:49.414Z