CVE-2026-45484

Name: CVE-2026-45484
Creator: NVD / NIST
Published: 2026-06-09T17:17:22.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2026-45484 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Microsoft	Sharepoint Server	< 16.0.19725.20384
Microsoft	Sharepoint Server	2016
Microsoft	Sharepoint Server	2019

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45484Vendor Advisory

Timeline

Published: Jun 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-45484?

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

How severe is CVE-2026-45484?

CVE-2026-45484 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45484?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45484?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST