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CVE-2026-69874 Microsoft CVE debrief

An untrusted pointer dereference vulnerability exists in the Windows Advanced Local Procedure Call (ALPC) component. This vulnerability allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 8.2 and is classified as HIGH severity. Affected product deployments should be identified in managed environments and assigned an owner for follow-up. The vulnerability impacts local privilege escalation, allowing attackers to gain elevated privileges. Official guidance from Microsoft should be reviewed to validate affected scope, severity, and vendor guidance. Compensating controls for exposed systems should be reviewed while remediation is scheduled

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

Defenders and security teams responsible for Windows systems, especially those concerned with local privilege escalation, should assess exposure and prioritize patching.

Why it matters

CVE-2026-69874 is a high-severity vulnerability in Windows ALPC that allows local privilege escalation. Defenders should prioritize patching and review vulnerability management processes.

  • Local privilege escalation is possible, allowing attackers to gain elevated privileges
  • Patching is required to prevent exploitation
  • Vulnerability management processes should be reviewed and updated

Technical summary

The vulnerability exists in the Windows Advanced Local Procedure Call (ALPC) component and allows an authorized attacker to elevate privileges locally through an untrusted pointer dereference. The vulnerability is a result of improper handling of pointers in the ALPC component, which can be exploited by an attacker to gain elevated privileges. Defenders should prioritize patching this vulnerability, especially in environments where local privilege escalation is a concern. The CVE record and NVD detail page provide official information about this vulnerability.

Defensive priority

Defenders should prioritize patching this vulnerability, especially in environments where local privilege escalation is a concern.

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible
  • Review and update vulnerability management processes to ensure timely patching
  • Monitor systems for potential exploitation attempts

Evidence notes

The vulnerability is described as an untrusted pointer dereference in Windows ALPC, which could allow an authorized attacker to elevate privileges locally. The CVE record and NVD detail page provide official information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69874 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69874

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

  • CVE-2026-69874 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69874

    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.