CVE-2025-53770
CISA KEV RANSOMWARE
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Priority: 0.00
BB Relevance:
10/100
Published: N/A
Modified: N/A
First seen: 2026-10-29
Status: pending_score
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.
CISA Known Exploited Vulnerability
Vendor / Product
Microsoft — SharePoint
Date Added
2025-07-20
Remediation Due
2025-07-21
Ransomware Use
CONFIRMED
CISA Mitigation Instructions: https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770; https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ ; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53770
Weakness Classification (1)
Affected Software (3)
| Vendor | Product | Version |
|---|---|---|
| microsoft | sharepoint_server | < 16.0.18526.20508 |
| microsoft | sharepoint_server | 2016 |
| microsoft | sharepoint_server | 2019 |
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