CVE-2026-62914: Microsoft Exchange Server Spoofing Vulnerability

Overview

Severity

High (CVSS 7.3)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/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-Aug

Released

2026-08-11

Description

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

FAQ

According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H). What does that mean for this vulnerability? An attacker who successfully exploited this vulnerability could craft a payload allowing them to access sensitive user data, which could result in unauthorized access to the victim's account or compromise of other confidential information.

Affected Products (4)

ESU

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

Server Software

• Microsoft Exchange Server Subscription Edition RTM

Security Updates (1)

• 5121573

Acknowledgments

P1hcn

Revision History

• 2026-08-11: Information published.