Auth bypass in Microsoft Sharepoint Enterprise Server 2016
CVE-2025-53771
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.999 (100.0th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.998 · newest: 0.999 · change: +0.001
Affected products
- Microsoft Sharepoint Enterprise Server 2016 — versions 16.0.0
- Microsoft Sharepoint Server 2019 — versions 16.0.0
- Microsoft Sharepoint Server Subscription Edition — versions 16.0.0
- Microsoft Sharepoint Server — versions 2016, 2019
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771 (vendor-advisory, patch, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Press/Media Coverage)
Frequently asked questions
- What is CVE-2025-53771?
- CVE-2025-53771 is a medium-severity vulnerability in Microsoft Sharepoint Enterprise Server 2016, classified under Improper Authentication. CVSS score: 6.5/10. Published 2025-07-20.
- How severe is CVE-2025-53771?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-53771 known to be exploited?
- 16 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.