---
id: "CVE-2026-112796"
page: "https://infrastack.ai/live/CVE-2026-112796"
kind: "vulnerability"
aliases: ["CVE-2026-112796"]
title: "Windows Event Collector: double free lets a local user gain higher privileges"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["event-collector", "infrastructure", "local-privilege-escalation", "self-hosted", "windows"]
not_affected_if: ["no-local-users", "service-not-running"]
published_at: "2026-11-10T19:18:41+00:00"
first_seen_at: "2026-11-10T19:24:33+00:00"
updated_at: "2026-11-11T00:06:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112796", "first_seen_at": "2026-11-10T19:24:33+00:00"}, {"source": "analyst", "url": "https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-112796", "first_seen_at": "2026-11-11T00:06:05+00:00", "cites": ["https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-112796"]}]
exploit_sources: []
---

# Windows Event Collector: double free lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-112796 (this .md is for agents)

A double free (CWE-415) in the Windows Event Collector Service lets a local user with an account raise privileges to those of the service. Microsoft rates it Important (CVSS 7.0). Exploitation needs a memory allocation to fail at a specific point, so it is hard to trigger. Microsoft says it is not exploited and not publicly disclosed.

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

## How to check

Check whether the Windows Event Collector service (wecsvc) exists and runs: 'sc query wecsvc' or Get-Service wecsvc. Then compare your OS build (winver) with the fixed build for your Windows version in the MSRC update guide for CVE-2026-112796. If the November 2026 cumulative update is installed, you are patched.

## Fix

Install the November 2026 Windows security update (MSRC release 2026-Nov, customer action required). Exact KB and fixed build numbers unknown: look them up on the MSRC update guide page for CVE-2026-112796 for your Windows version.

## Timeline

- 2026-11-10T19:24:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112796
- 2026-11-11T00:06:05+00:00 analyst https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-112796 — MSRC record (API) read: Important, CVSS 7.0 local/high complexity, not exploited, not publicly disclosed, Exploitation Less Likely, customer action required (Nov 2026 release). Affected builds and KB numbers not in the record; sibling CVE-2026-112793 lists Server 2016-2025 but is a different CVE, not assumed.

## Documents

- [advisory] MSRC: CVE-2026-112796 Windows Event Collector Service Elevation of Privilege Vulnerability https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-112796

## From the sources

Double free in Windows Event Collector Service 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_