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PatchSiren cyber security CVE debrief

CVE-2026-42971 Microsoft CVE debrief

CVE-2026-42971 is a medium-severity vulnerability in Windows Push Notifications that allows an authorized attacker to disclose information locally. The vulnerability has a CVSS score of 5.5 and is classified as CWE-200. It was published on 2026-06-09T17:17:12.650Z and last modified on 2026-06-11T19:52:35.303Z.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-09
Advisory published
2026-06-09
Advisory updated
2026-07-09

Who should care

Administrators and users of affected Windows systems should apply patches to mitigate this vulnerability.

Technical summary

The vulnerability is caused by the use of an uninitialized resource in Windows Push Notifications. An authorized attacker can exploit this vulnerability to disclose information locally.

Defensive priority

Medium

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Refer to resourceLinkAnnotations for more information.

Evidence notes

The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42971 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42971

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42971 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42971

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.