Microsoft SharePoint Improper Authentication Vulnerability (CVE-2025-49706)
Severity: medium · Patch status: unpatched · Since 2025-07-22 · CVE-2025-49706
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. CISA added CVE-2025-49706 to its Known Exploited Vulnerabilities catalog on Jul 22, 2025, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
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.
- US federal agencies must remediate by Jul 23, 2025 (BOD 22-01); treat that as the outer limit.
Sources
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