PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-48571 Microsoft CVE debrief

CVE-2026-48571 is a use-after-free vulnerability in Windows App Installer. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. This vulnerability allows an authorized attacker to elevate privileges locally, which could lead to a significant impact on the system. The CVE record was published on 2026-07-14T17:16:50.023Z and has not been modified since then. The NVD entry is currently Undergoing Analysis.

Vendor
Microsoft
Product
Windows 11 version 23H2
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 App Installer should be aware of this vulnerability, as it allows an authorized attacker to elevate privileges locally. This could lead to a significant impact on the system, including unauthorized access to sensitive data and disruption of system operations. Administrators should verify the Windows App Installer version and ensure it is up-to-date.

Technical summary

CVE-2026-48571 is a use-after-free vulnerability in Windows App Installer. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. This vulnerability allows an authorized attacker to elevate privileges locally, which could lead to a significant impact on the system. The vulnerability is caused by a use-after-free error in the Windows App Installer. Administrators should verify the Windows App Installer version and ensure it is up-to-date.

Defensive priority

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

Recommended defensive actions

  • Apply the patch provided by the vendor
  • Verify that the Windows App Installer is up-to-date
  • Monitor for any suspicious activity related to 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 2026-07-14T17:16:50.023Z and has not been modified since then. The NVD entry is currently Undergoing Analysis. Administrators should verify the Windows App Installer version and ensure it is up-to-date. The vulnerability allows an authorized attacker to elevate privileges locally, which could lead to a significant impact on the system. There is no evidence of exploitation in the wild, but defenders should monitor for suspicious activity related to the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48571 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48571

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

  • CVE-2026-48571 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48571

    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.