CVE-2026-69874: CWE-822: Untrusted Pointer Dereference in Microsoft Windows 10 Version 1809
Description
CVE-2026-69874 is a high-severity vulnerability in Microsoft Windows 10 Version 1809 and related builds involving an untrusted pointer dereference in the Windows ALPC component. This flaw allows an authorized local attacker to elevate privileges, potentially gaining full control of the affected system. The vulnerability affects multiple Windows 10 versions prior to their respective patched builds. An official fix is available from Microsoft.
CVSS v3.1
Score 8.2high
Affected software
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, tracked as CVE-2026-69874 and classified under CWE-822 (Untrusted Pointer Dereference), exists in the Windows ALPC (Advanced Local Procedure Call) mechanism. It enables an authorized local attacker to dereference untrusted pointers, leading to a local privilege escalation with complete impact on confidentiality, integrity, and availability. The CVSS 3.1 base score is 8.2, indicating high severity. Multiple Windows 10 versions are affected, with patches released by Microsoft to address the issue. No known exploits in the wild have been reported at this time.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining SYSTEM-level access. This can lead to full compromise of the affected system, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69874 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T22:53:31.650Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69874","vendor":"Microsoft"}]
Threat ID: 6aa04534acd9273b49fa9a76
Added to database: 09/08/2026, 17:26:12 UTC
Last enriched: 10/16/2026, 21:37:58 UTC
Last updated: 10/24/2026, 03:05:10 UTC
Views: 31
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