Known exploited vulnerability · CISA KEV

CVE-2025-49706: Microsoft SharePoint Improper Authentication Vulnerability

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.

CVE-2025-49706

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2025-07-22: attackers are using it right now. It is known to be used in ransomware campaigns.

CISA KEV: Listed; Added 2025-07-22 · federal fix-by 2025-07-23
EPSS (30 days): 99%; Higher than 99.9% of CVEs · 2026-11-01
CVSS: No score

What CISA says

Microsoft SharePoint Improper Authentication Vulnerability

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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How to check if you are exposed to CVE-2025-49706

Find every Microsoft SharePoint system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2025-49706.

US federal agencies had to fix this by 2025-07-23. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

2025-07-22 · Added to CISA's Known Exploited Vulnerabilities catalog
2025-07-23 · Fix-by date for US federal agencies, passed 466 days ago

Vendor advisories and fixes

Weakness type

CWE-287

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Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.