Medium 6.5Known exploited (CISA KEV)Published Jul 8, 2025

CVE-2025-49706Microsoft SharePoint Server Spoofing Vulnerability

Updated under an hour ago (2026-10-19 09:00 UTC)

Does this affect you?

It affects Microsoft SharePoint Enterprise Server 2016 and 4 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jul 22, 2025; federal agencies had to remediate by Jul 23, 2025, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for Microsoft SharePoint Enterprise Server 2016

Exploited in the last 30 days

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C
Weakness (CWE): CWE-287
Known exploited: Added to CISA KEV Jul 22, 2025; federal remediation due Jul 23, 2025; known ransomware useDisconnect 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.
EPSS (exploitation in the next 30 days): 99.09% (percentile 100)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Aug 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft SharePoint Enterprise Server 2016 microsoft:sharepoint_enterprise_server_2016 (from the name)	from 16.0.0 before 16.0.5508.1000	CNA record
Microsoft Microsoft SharePoint Server 2019 microsoft:sharepoint_server_2019 (from the name)	from 16.0.0 before 16.0.10417.20027	CNA record
Microsoft Microsoft SharePoint Server Subscription Edition microsoft:sharepoint_server_subscription_edition (from the name)	from 16.0.0 before 16.0.18526.20424	CNA record
microsoft sharepoint_enterprise_server microsoft:sharepoint_enterprise_server	2016	NVD
microsoft sharepoint_server microsoft:sharepoint_server	before 16.0.18526.20424; 2019	NVD

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706vendor-advisory, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-49706us-government-resource
https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/press/media-coverage, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.