---
id: CVE-2026-65801
title: Microsoft Exchange Online Elevation of Privilege Vulnerability
summary: >-
  Server-side request forgery (ssrf) in Microsoft Exchange Online allows an
  unauthorized attacker to elevate privileges over a network.
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-918
vendor: Microsoft
product: Microsoft Exchange Online
affected:
  - exchange_online -
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-08-21T00:00:00+00:00'
published: '2026-08-20'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:43:56.747Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-65801'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65801'
    label: Microsoft Exchange Online Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00511
epssPercentile: 0.42617
ingestedAt: '2026-09-08T18:07:34.902Z'
---

## Overview

Server-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.

## Affected

- `exchange_online -`

## Remediation

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