CVE-2025-49706
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Actively exploited
- In the CISA exploited-vulnerabilities catalogue since Jul 22, 2025
- US federal agencies must remediate it by Jul 23, 2025 (BOD 22-01)
- First attack observed 9 days after disclosure
- Confirmed by sensors, not only by reports
- Used in ransomware campaigns
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.
Source: CISA KEV · Oct 1, 2026 Oct 1, 2026 Oct 1, 2026 Sep 30, 2026 Sep 29, 2026 Sep 28, 2026
CVSS score6.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NWeakness type (CWE)CWE-287
Vendorsmicrosoft
Affected products
| Vendors | Product | Versions |
|---|---|---|
| microsoft | sharepoint enterprise server | 2016 |
| microsoft | sharepoint server | < 16.0.18526.20424 |
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This product uses the NVD API but is not endorsed or certified by the NVD.