CVE

CVE-2026-45659

P1⬤ KNOWN RANSOMWARE USE

Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability

Microsoft · SharePoint Server

Date added (CISA)

2026-07-01

Remediation due

2026-07-04

Known ransomware use

Yes

Remediation priority

P1 — known ransomware use · past CISA due date

Associated with

Related to

Lazarus Group (TraderTraitor cluster) / APT38 / BlueNoroff · SPECTREcampaignCorrelated cluster2026-09-16
DysphoriacampaignCorrelated cluster2026-08-24

Description

Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

Source: NVD ↗ · CISA KEV Catalog ↗