CVE-2025-53770: listed in the CISA KEV catalog

CVE-2025-53770 · CVSS 9.8 CRITICAL · EPSS 100.0% · KEV 2025-07-20

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

Is CVE-2025-53770 exploited?

• Listed in the CISA KEV catalog on 2025-07-20.
• Federal remediation due 2025-07-21.
• Past that date by 390 days.
• Used in ransomware campaigns.
• EPSS puts exploitation in the next 30 days at 100.0%.
• Public exploit code: packaged in a public tool.
• Public detection rules exist.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2025-53770

• Voice Phishing Drives 11% of Intrusions in 2025 (2026-03-25)

Primary sources

• NVD record
• CISA KEV catalog
• Metasploit: exploit/windows/http/sharepoint_toolpane_rce
• Exploit-DB 52405
• Nuclei template

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.