---
id: "CVE-2026-88227"
page: "https://infrastack.ai/live/CVE-2026-88227"
kind: "vulnerability"
aliases: ["CVE-2026-88227"]
title: "Windows LSASS: heap overflow lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "local-privilege-escalation", "lsass", "self-hosted", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:21:30+00:00"
first_seen_at: "2026-11-10T19:25:19+00:00"
updated_at: "2026-11-10T20:45:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88227", "first_seen_at": "2026-11-10T19:25:19+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-10T20:45:51+00:00"}]
exploit_sources: []
---

# Windows LSASS: heap overflow lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-88227 (this .md is for agents)

A heap-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local attacker elevate their privileges. Successful exploitation gives the attacker control over a privileged system component on the same machine.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Unknown until MSRC lists the KBs. Check that the November 2026 cumulative update (released 2026-11-10) is installed via Windows Update, then look up CVE-2026-88227 in the Microsoft Security Update Guide for your build's KB.

## Timeline

- 2026-11-10T19:25:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-88227
- 2026-11-10T20:45:51+00:00 analyst — Could not read the MSRC Update Guide entry (page empty, CVRF doc empty). The MSRC API only shows the CVE is in the November 2026 Security Updates (released 2026-11-10). No affected builds, KB numbers or exploitation status found, so none are verified. Rapid7's CVE-2026-70015 is a different LSASS CVE, not used. Revisit when MSRC or NVD lists the KBs.

## From the sources

Heap-based buffer overflow in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to elevate privileges locally.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_