CVE-2026-87711

Analyzed Analyzed - Analysis Complete

Windows Installer Stack-Based Buffer Overflow

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-87711

EUVD

EUVD-2026-99582

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow vulnerability in Windows Installer. It allows an authorized attacker with local access to elevate their privileges on affected systems.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable Windows Installer versions and monitoring for unusual privilege escalation attempts. Use Windows Update to ensure all systems are patched. Check installed Windows versions with 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' in Command Prompt. Review event logs for suspicious installer activity using 'wevtutil qe System /q:"*[System[EventID=1000]]"' to look for crashes.

Impact Analysis

An attacker could exploit this to gain higher-level permissions on your system, potentially allowing them to install malicious software, access sensitive data, or take control of your device.

Compliance Impact

This vulnerability allows local privilege escalation via a stack-based buffer overflow in Windows Installer. Such unauthorized privilege elevation could lead to unauthorized access to sensitive data or system control, potentially violating compliance requirements for data protection standards like GDPR or HIPAA, which mandate strict access controls and protection of personal or health information.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the Windows Installer vulnerability. Monitor Microsoft's security advisories for updates and disable unnecessary services or applications that interact with Windows Installer if not required.

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