CVE-2025-53770 — Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

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.

How to fix CVE-2025-53770

No package mapping is available — consult the references below for vendor-specific guidance.

Is CVE-2025-53770 being exploited?

Yes — CVE-2025-53770 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.

Affected packages (0)

No package mapping in OSV.