CVE-2026-45483: Microsoft Office Project Server Spoofing Vulnerability

Overview

Severity
Medium (CVSS 4.6)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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 Office Project Server allows an authorized attacker to perform spoofing over a network.

FAQ

According to the CVSS metric, user interaction is required (UI:R) and privileges required is Low (PR:L). What does that mean for this vulnerability? An authorized attacker with guest privileges must send a victim a malicious site and convince them to open it. According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L), and integrity (I:L) but lead to no loss of availability (A:N). What is the impact of this vulnerability? An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability). Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector.

Affected Products (3)

Microsoft Office

  • Microsoft SharePoint Server Subscription Edition
  • Microsoft SharePoint Enterprise Server 2016
  • Microsoft SharePoint Server 2019

Security Updates (3)

Acknowledgments

41ae55e9310ff27fa6f26af4727e5590

Revision History

  • 2026-06-09: Information published.