CVE-2026-88164Network attack vector

Authenticated privilege escalation via missing authorization

Published Oct 14, 2026 · Updated Oct 14, 2026

Missing authorization in Microsoft SharePoint Server Subscription Edition allows remote authenticated users to elevate privileges over a network. The published record does not identify the affected component, request, or operation that omits authorization. Existing low-privileged access is required; the resulting role and accessible resources are not specified.

CVSS severityUnavailable
Unscored
EPSS probability0.74%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Microsoft SharePoint Server Subscription Edition allows remote authenticated users to elevate privileges over a network. The published record does not identify the affected component, request, or operation that omits authorization. Existing low-privileged access is required; the resulting role and accessible resources are not specified.

The record

CVE
CVE-2026-88164
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
Microsoft Corporation
Product
Microsoft SharePoint Server Subscription Edition
Classifications
CWE-862
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <16.0.20326.20190

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft Corporation · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.20326.20190

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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