Microsoft · SharePoint
CVE-2025-49706
Microsoft SharePoint Server Spoofing Vulnerability
What it is
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
CISA: Microsoft SharePoint contains an improper authentication vulnerability that allows an authorized attacker to perform spoofing over a network. Successfully exploitation could allow an attacker to view sensitive information and make some changes to disclosed information. This vulnerability could be chained with CVE-2025-49704. CVE-2025-53771 is a patch bypass for CVE-2025-49706, and the updates for CVE-2025-53771 include more robust protection than those for CVE-2025-49706.
What to do
Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Deadline for US federal agencies: July 23, 2025
More exploited flaws from Microsoft
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Sep 25, 2026 | Code Injection | SharePoint | High 8.8 | 8.2% |
| Aug 18, 2026 | Weak Authentication | SharePoint | Critical 9.1 | 70% |
| Jul 22, 2026 | Deserialization of Untrusted Data Vulnerability | SharePoint | Critical 9.8 | 3.0% |
| Jul 16, 2026 | Deserialization of Untrusted Data | SharePoint | Critical 9.8 | 16% |
| Mar 18, 2026 | Deserialization of Untrusted Data | SharePoint | Critical 9.8 | 29% |
| Jul 22, 2025 | Code Injection | SharePoint | High 8.8 | >99.9% |
| Jul 20, 2025 | Deserialization of Untrusted Data | SharePoint | Critical 9.8 | >99.9% |
| Oct 22, 2024 | Deserialization | SharePoint | High 7.2 | 51% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.