CVE-2026-42973

Local information disclosure via uninitialized resource

Published Jun 9, 2026 · Updated Jun 9, 2026

Information disclosure in Windows Push Notifications allows local users on affected Windows releases to read sensitive data. The component exposes data from an uninitialized resource, but Microsoft has not identified the resource or affected code path. A low-privileged local account is required; the documented impact is confidentiality loss without integrity or availability impact.

CVSS severity5.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Windows Push Notifications allows local users on affected Windows releases to read sensitive data. The component exposes data from an uninitialized resource, but Microsoft has not identified the resource or affected code path. A low-privileged local account is required; the documented impact is confidentiality loss without integrity or availability impact.

The record

CVE
CVE-2026-42973
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-200
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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=10.0.17763.0 <10.0.17763.8880

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.8880
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.32995
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.8655
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9234
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.8655
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.7417
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.9234
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.7417
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.8880
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2269
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7219
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9234
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.5256
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.32995
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.8880

Published CVSS scores

5.5MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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