---
id: "CVE-2026-85801"
page: "https://infrastack.ai/live/CVE-2026-85801"
kind: "vulnerability"
aliases: ["CVE-2026-85801"]
title: "Windows LSASS: use-after-free lets an authorized user gain local privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 10 1607 / Server 2016", "fixed": [], "affected": "10.0.14393.0 - 10.0.14393.9688", "ecosystem": "vendor"}, {"name": "Windows 10 1809 / Server 2019", "fixed": [], "affected": "10.0.17763.0 - 10.0.17763.9487", "ecosystem": "vendor"}, {"name": "Windows 10 21H2/22H2", "fixed": [], "affected": "10.0.19044.0 - 10.0.19045.7846", "ecosystem": "vendor"}, {"name": "Windows 11 23H2", "fixed": [], "affected": "10.0.22631.0 - 10.0.22631.7711", "ecosystem": "vendor"}, {"name": "Windows 11 24H2/25H2 / Server 2025", "fixed": [], "affected": "10.0.26100.0 - 10.0.26100.9974 (Server 2025 to .33822; 25H2 10.0.26200.x to .9974)", "ecosystem": "vendor"}, {"name": "Windows Server 2022", "fixed": [], "affected": "10.0.20348.0 - 10.0.20348.5870", "ecosystem": "vendor"}]
ecosystems: []
tags: ["endpoints", "infrastructure", "local-privilege-escalation", "lsass", "windows"]
not_affected_if: ["no-local-untrusted-users"]
published_at: "2026-11-10T19:21:25+00:00"
first_seen_at: "2026-11-10T19:25:18+00:00"
updated_at: "2026-11-10T21:10:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85801", "first_seen_at": "2026-11-10T19:25:18+00:00"}, {"source": "analyst", "url": "https://cve.imfht.com/detail/CVE-2026-85801", "first_seen_at": "2026-11-10T21:10:50+00:00", "cites": ["https://cve.imfht.com/detail/CVE-2026-85801"]}]
exploit_sources: []
---

# Windows LSASS: use-after-free lets an authorized user gain local privileges

Link for people: https://infrastack.ai/live/CVE-2026-85801 (this .md is for agents)

A use-after-free flaw in the Windows Local Security Authority Subsystem Service (LSASS) lets an attacker who already has an account on the machine raise their privileges. The sources give a CVSS score of 7.8 and say the attack is local.

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

## Affected

- vendor:Windows 10 1607 / Server 2016 affected 10.0.14393.0 - 10.0.14393.9688 fixed no fixed version listed
- vendor:Windows 10 1809 / Server 2019 affected 10.0.17763.0 - 10.0.17763.9487 fixed no fixed version listed
- vendor:Windows 10 21H2/22H2 affected 10.0.19044.0 - 10.0.19045.7846 fixed no fixed version listed
- vendor:Windows 11 23H2 affected 10.0.22631.0 - 10.0.22631.7711 fixed no fixed version listed
- vendor:Windows 11 24H2/25H2 / Server 2025 affected 10.0.26100.0 - 10.0.26100.9974 (Server 2025 to .33822; 25H2 10.0.26200.x to .9974) fixed no fixed version listed
- vendor:Windows Server 2022 affected 10.0.20348.0 - 10.0.20348.5870 fixed no fixed version listed

## How to check

Run winver or [System.Environment]::OSVersion and compare the build with the affected ranges; apply the November 2026 cumulative update and check the MSRC Update Guide entry for the exact KB (not confirmed here).

## Timeline

- 2026-11-10T19:25:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-85801
- 2026-11-10T21:10:50+00:00 analyst https://cve.imfht.com/detail/CVE-2026-85801 — MSRC page and CVRF API not readable (JS-only/empty); data from aggregator mirroring CVE List V5. Patch KB and fixed builds unconfirmed; nothing verified. No exploitation or public PoC found.

## Documents

- [describes] CVE-2026-85801 (aggregator, mirrors CVE List V5 data) https://cve.imfht.com/detail/CVE-2026-85801

## From the sources

Use after free 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_