CVE-2026-87711

7.8High

Published 13 Oct 2026 · NVD status: Analyzed · AI triage by gemini-3.8-flash

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-121

Impact

Local attackers with an existing account can gain SYSTEM privileges and take full control of the Windows host. They need local credentials or an existing low-privilege shell to trigger the flaw.

Root cause

A stack-based buffer overflow exists within the Windows Installer service handling.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the relevant Microsoft security update referenced in the advisory. No interim workarounds are documented.

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

Ad · In-content banner

NVD description

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87711PatchVendor Advisory

Source: nvd.nist.gov/vuln/detail/CVE-2026-87711