CVE-2025-55243: Microsoft OfficePlus Spoofing Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2025-Sep

Released

2025-09-09

EPSS Score

0.11% (percentile: 30.0%)

Description

Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized attacker to perform spoofing over a network.

Affected Products (1)

Microsoft Office

• Microsoft OfficePLUS

Security Updates (1)

• Release Notes

Acknowledgments

<a href="https://twitter.com/edwardzpeng">Zhiniang Peng</a> with HUST

Revision History

• 2025-09-09: Information published.