CVE-2026-47631: Microsoft Exchange Server Spoofing Vulnerability

Overview

Severity

High (CVSS 8.1)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jun

Released

2026-06-09

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

FAQ

How could an attacker exploit this vulnerability? An attacker could attempt to exploit this vulnerability by convincing an Exchange administrator to open specially crafted content, such as a malicious link or message, which could allow the attacker to run code in the administrator’s web session.

Affected Products (4)

ESU

• Microsoft Exchange Server 2016 Cumulative Update 23
• Microsoft Exchange Server 2019 Cumulative Update 14
• Microsoft Exchange Server 2019 Cumulative Update 15

Server Software

• Microsoft Exchange Server Subscription Edition RTM

Security Updates (1)

• 5094139

Acknowledgments

Anonymous, 41ae55e9310ff27fa6f26af4727e5590

Revision History

• 2026-06-09: Information published.