Microsoft SharePoint Improper Authentication Vulnerability
Description
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.
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Details
- Vendor
- Microsoft
- Product
- SharePoint
- CVE
- CVE-2025-49706
- Affected versions
- Microsoft SharePoint Enterprise Server 2016 16.0: from 16.0.0 to 16.0.5508.1000 (excluded) — fixed in 16.0.5508.1000
Microsoft SharePoint Server 2019 16.0: from 16.0.0 to 16.0.10417.20027 (excluded) — fixed in 16.0.10417.20027
Microsoft SharePoint Server Subscription Edition 16.0: from 16.0.0 to 16.0.18526.20424 (excluded) — fixed in 16.0.18526.20424 (from the advisory and NVD; check the exact builds in the official advisory) - CVSS score
- 6.5
- Actively exploited
- Yes, listed in the CISA Known Exploited Vulnerabilities catalog
- CISA due date
- July 23, 2025 (deadline for US federal agencies: a good benchmark for you too)
- Source
- CISA KEV – original advisory
- Published
- July 22, 2025
The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.