CVE

CVE-2025-53770

P1⬤ KNOWN RANSOMWARE USE

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft · SharePoint

Date added (CISA)

2025-07-20

Remediation due

2025-07-21

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
BadIIScampaignCorrelated cluster2026-08-26
Lazarus Group (TraderTraitor cluster) / APT38 / BlueNoroff · ZshBucketcampaignCorrelated cluster2026-08-26

Description

Microsoft SharePoint Server on-premises contains a deserialization of untrusted data vulnerability that could allow an unauthorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-53771. CVE-2025-53770 is a patch bypass for CVE-2025-49704, and the updates for CVE-2025-53770 include more robust protection than those for CVE-2025-49704.

Source: NVD ↗ · CISA KEV Catalog ↗