Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

When

2025-07-20 00:00 UTC · day precision

Where

Global (internet)

Category

cyber_exploit · ransomware

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.

Sources

• CISA ↗ · first seen 2025-07-20 00:00 UTC

Defaxon links out to the original reporting and never republishes article text.

Correlated events

Computed by the Defaxon correlation engine — linked by shared actors, co-location, and temporal proximity. Scored hypotheses, never causal claims.

No correlated events found in the current window. As more events arrive, connections form automatically.

← Back to the live map