CVE-2025-49706 on CISA KEV

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

01What CISA says about this vulnerability

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

02Required action — verbatim from CISA

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.

03Notes & references

• msrc.microsoft.com — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Microsoft	Microsoft SharePoint Enterprise Server 2016	16.0.0
Microsoft	Microsoft SharePoint Server 2019	16.0.0
Microsoft	Microsoft SharePoint Server Subscription Edition	16.0.0

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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