CVE-2022-26939

Local privilege escalation via race condition

Published May 10, 2022 · Updated Jan 2, 2025

Privilege escalation in Microsoft Storage Spaces Direct on affected Windows Server builds allows local users to gain elevated privileges. Microsoft discloses only that exploitation requires winning a race condition; the affected code path and incorrect operation remain undisclosed. Exploitation requires low-privileged local access and no user interaction, and success can compromise host confidentiality, integrity, and availability.

CVSS severity7.0
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Microsoft Storage Spaces Direct on affected Windows Server builds allows local users to gain elevated privileges. Microsoft discloses only that exploitation requires winning a race condition; the affected code path and incorrect operation remain undisclosed. Exploitation requires low-privileged local access and no user interaction, and success can compromise host confidentiality, integrity, and availability.

The record

CVE
CVE-2022-26939
Published
May 10, 2022
Updated
Jan 2, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record 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=10.0.17763.0 <10.0.17763.2928

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.2928
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.5125
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.5125
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.2928
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1706
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.707

Published CVSS scores

7.0Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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