CVE-2025-64677: Office Out-of-Box Experience Spoofing Vulnerability

Overview

Severity

High (CVSS 8.2)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Patch Tuesday

2025-Dec

Released

2025-12-18

EPSS Score

0.06% (percentile: 18.2%)

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Office Out-of-Box Experience allows an unauthorized attacker to perform spoofing over a network.

FAQ

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Affected Products (1)

Microsoft Office

• Office Out-of-Box Experience

Acknowledgments

jhilakshi

Revision History

• 2025-12-18: Information published.