PatchSiren cyber security CVE debrief

CVE-2026-42906 Microsoft CVE debrief

CVE-2026-42906 is a MEDIUM severity vulnerability (CVSS Score: 5.5) in Windows Shell that allows an authorized attacker to disclose information locally. The vulnerability was published on 2026-06-09T17:17:10.310Z and last modified on 2026-06-11T16:13:37.987Z.

Vendor: Microsoft
Product: Windows Shell
CVSS: MEDIUM 5.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-06-11
Advisory published: 2026-06-09
Advisory updated: 2026-06-11

Who should care

Administrators and users of Microsoft Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability.

Technical summary

The vulnerability is caused by exposure of sensitive information to an unauthorized actor in Windows Shell. An authorized attacker can exploit this vulnerability to disclose information locally.

Defensive priority

MEDIUM

Recommended defensive actions

Apply patches or updates provided by Microsoft to vulnerable systems.
Refer to the vendor advisory at resourceLinkAnnotations with id 'ref-4' for more information.

Evidence notes

The CVE record and details are sourced from official databases.

Sources and references

Verified primary and authoritative sources

CVE-2026-42906 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-42906

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-42906 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42906

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

Supplemental references

Mitigation or vendor reference
Unverified legacy reference

URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42906

[email protected] - Vendor Advisory

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.