---
id: CVE-2026-45583
title: >-
  Improper control of generation of code ('code injection') in Microsoft
  Exchange Server allows an unauthorized attacker to execute code over a
  network.
summary: >-
  Improper control of generation of code ('code injection') in Microsoft
  Exchange Server allows an unauthorized attacker to execute code over a
  network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: microsoft
product: exchange_server
affected:
  - exchange_server = 2016
  - exchange_server = 2019
  - exchange_server_subscription_edition < 15.02.2562.043
patched:
  - exchange_server_subscription_edition 15.02.2562.043
published: '2026-06-09'
updated: '2026-07-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45583'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45583'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00522
epssPercentile: 0.43336
ingestedAt: '2026-07-28T23:40:23.647Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-10T03:56:06.048278Z'
---

## Overview

Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

## Affected

- `exchange_server = 2016`
- `exchange_server = 2019`
- `exchange_server_subscription_edition < 15.02.2562.043`

## Remediation

Upgrade past the affected range:

- `exchange_server_subscription_edition 15.02.2562.043`