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PatchSiren cyber security CVE debrief

CVE-2026-56173 Microsoft CVE debrief

A use-after-free vulnerability exists in Windows WebView, which allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and a severity of HIGH. The CVE record was published on 2026-07-14T18:18:23.310Z and has not been modified since then. The NVD entry is currently Awaiting Analysis. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. Administrators and users of Windows WebView should be aware of this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7
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

Administrators and users of Windows WebView should be aware of this vulnerability, as it allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and a severity of HIGH. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor.

Technical summary

A use-after-free vulnerability exists in Windows WebView. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a severity of HIGH. The CVE record was published on 2026-07-14T18:18:23.310Z and has not been modified since then. The NVD entry is currently Awaiting Analysis.

Defensive priority

High priority should be given to patching this vulnerability, as it allows for local privilege escalation.

Recommended defensive actions

  • Apply patches or updates provided by the vendor
  • Monitor systems for suspicious activity
  • Implement compensating controls to limit the impact of the vulnerability
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:18:23.310Z and has not been modified since then. The NVD entry is currently Awaiting Analysis. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability has a CVSS score of 7 and a severity of HIGH. Administrators and users of Windows WebView should be aware of this vulnerability, as it allows an authorized attacker to elevate privileges locally.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56173 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56173

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

  • CVE-2026-56173 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56173

    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.