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PatchSiren cyber security CVE debrief

CVE-2026-50434 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:17:47.413Z and has not been modified since then. The NVD entry is currently Analyzed. This medium-severity vulnerability (CVSS Score: 5.5) allows an authorized attacker to disclose sensitive information locally through Windows Push Notifications, affecting multiple versions of Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025. Microsoft has provided a patch for this vulnerability. Security teams and administrators responsible for Windows systems, particularly those using Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025, should be aware of this vulnerability and apply patches immediately, especially for systems handling sensitive information. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, indicating Local Attack Vector with Low Attack Complexity and Privileges Required.

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Security teams and administrators responsible for Windows systems, particularly those using Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025, should be aware of this vulnerability.

Technical summary

CVE-2026-50434 is a medium-severity vulnerability (CVSS Score: 5.5) that allows an authorized attacker to disclose sensitive information locally through Windows Push Notifications. The vulnerability affects multiple versions of Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025. Microsoft has provided a patch for this vulnerability.

Defensive priority

Apply patches immediately, especially for systems handling sensitive information.

Recommended defensive actions

  • Apply the patch provided by Microsoft to prevent exploitation.
  • Conduct a thorough inventory of affected systems and prioritize patching based on risk.
  • Implement compensating controls such as monitoring for suspicious activity related to Windows Push Notifications.
  • Ensure that all Windows systems are up-to-date with the latest security patches.

Evidence notes

The CVE record and NVD details indicate that this vulnerability allows an authorized attacker to disclose information locally through Windows Push Notifications. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, indicating Local Attack Vector with Low Attack Complexity and Privileges Required.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50434 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50434

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

  • CVE-2026-50434 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50434

    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.