CVE-2025-49706—Microsoft SharePoint Improper Authentication Vulnerability

Vulnerability Name

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

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.

Additional Notes

• 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-2025-49706
• https://nvd.nist.gov/vuln/detail/CVE-2025-49706

Related News Articles

• Chinese Threat Actors Exploit ToolShell SharePoint Flaw Weeks After Microsoft's July PatchOctober 22, 2025
• Sharepoint ToolShell attacks targeted orgs across four continentsOctober 22, 2025
• The Heat Wasn't Just Outside: Cyber Attacks Spiked in Summer 2025August 5, 2025
• Ransomware gangs join attacks targeting Microsoft SharePoint serversAugust 4, 2025
• Storm-2603 Deploys DNS-Controlled Backdoor in Warlock and LockBit Ransomware AttacksAugust 1, 2025

Related Weaknesses

• CWE-287