PatchSiren cyber security CVE debrief

CVE-2026-45483 Microsoft CVE debrief

CVE-2026-45483 is a cross-site scripting (XSS) vulnerability in Microsoft Office Project Server. The vulnerability has a CVSS score of 4.6 and a severity rating of MEDIUM. An authorized attacker can exploit this vulnerability to perform spoofing over a network.

Vendor: Microsoft
Product: Microsoft SharePoint Enterprise Server 2016
CVSS: MEDIUM 4.6
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-06-09
Advisory published: 2026-06-09
Advisory updated: 2026-06-09

Who should care

Users of Microsoft Office Project Server should be aware of this vulnerability and take necessary precautions to mitigate the risk.

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation, allowing an attacker to inject malicious code. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

Defensive priority

MEDIUM

Recommended defensive actions

Apply patches or updates provided by Microsoft to fix the vulnerability.
Implement additional security measures, such as input validation and output encoding, to prevent similar vulnerabilities.

Evidence notes

The vendor is listed as Unknown Vendor, but there is evidence suggesting that the product is Microsoft Office Project Server.

Official resources

CVE-2026-45483 was published on 2026-06-09T17:17:22.727Z and modified on 2026-06-09T19:32:51.440Z.