---
id: CVE-2026-59118
title: Copilot Cowork Elevation of Privilege Vulnerability
summary: >-
  Improper authorization in Copilot Cowork allows an unauthorized attacker to
  elevate privileges over a network.
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-285
vendor: Microsoft
product: Copilot Cowork
affected:
  - copilot_cowork -
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-06T00:00:00+00:00'
published: '2026-08-06'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:39:16.794Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-59118'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59118'
    label: Copilot Cowork Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00716
epssPercentile: 0.51796
ingestedAt: '2026-09-08T18:07:34.886Z'
---

## Overview

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

## Affected

- `copilot_cowork -`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.