CVEs / CVE-2025-49706
CVE-2025-49706: Microsoft SharePoint Improper Authentication Vulnerability
- Known exploited in the CISA KEV catalog since 22 Jul 2025
- medium 6.5 CVSS 3.1 (from the CNA)
- EPSS 99% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
Description
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Microsoft SharePoint Enterprise Server 2016 | from 16.0.0, before 16.0.5508.1000 | 16.0.5508.1000 |
| Microsoft Microsoft SharePoint Server 2019 | from 16.0.0, before 16.0.10417.20027 | 16.0.10417.20027 |
| Microsoft Microsoft SharePoint Server Subscription Edition | from 16.0.0, before 16.0.18526.20424 | 16.0.18526.20424 |
Exploitation
| In CISA KEV since | 22 Jul 2025 |
|---|---|
| Due date for US federal agencies | 23 Jul 2025 |
| Used in ransomware campaigns | Known |
| Required 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. |
Severity
| CVSS 3.1 | 6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-287 |
References
- CVE-2025-49706 on NVD
- CVE-2025-49706 in the CISA KEV catalog
- https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770 (cited by CISA)
- https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ (cited by CISA)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706 (cited by CISA)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-49706 US 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
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.