What it is
CVE-2025-53771 is an unauthenticated Microsoft SharePoint Server Spoofing Vulnerability affecting Microsoft Microsoft SharePoint Enterprise Server 2016 and 2 other products. Improper authentication in Microsoft Office...
Vulnerability report
CVE-2025-53771
Microsoft SharePoint Server Spoofing Vulnerability
Microsoft / Microsoft SharePoint Enterprise Server 2016 · affected before 16.0.5513.1001
- Severity
- CVSS 6.5 · Medium
- Confidence
- —
- Exploit status
- —
- EPSS
- —
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
No. KEV Intelligence has not recorded active exploitation signals yet.
Who is affected?
Microsoft / Microsoft SharePoint Enterprise Server 2016 affected before 16.0.5513.1001.
What should we do?
Track for updates. Assess relevance to your asset inventory and enrichment workflows.
Overview
Microsoft SharePoint Server Spoofing Vulnerability
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Vendor
Product
Affected
Status
Microsoft
Microsoft SharePoint Enterprise Server 2016
Before 16.0.5513.1001
Affected
Microsoft
Microsoft SharePoint Server 2019
Before 16.0.10417.20037
Affected
Microsoft
Microsoft SharePoint Server Subscription Edition
Before 16.0.18526.20508
Affected
- Published
- 20 Jul 2025
- Exploited since
- —
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
nuclei_scanner
CVE References
- Microsoft SharePoint Server Spoofing Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771
Exploitation evidence
Exploitation evidence for this CVE
Catalogues and sources that list this CVE as a known exploited vulnerability, when available.
No exploitation evidence rows are recorded for this CVE yet.
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nuclei template detected 01 Jun 2026.
View Nuclei template (opens in new tab)Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53771.yaml | 01 Jun 2026 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
6.5
Medium
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
EPSS
—
Weaknesses
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
Microsoft SharePoint Server - Authentication Bypass (ToolShell)
nuclei · Created Unknown
Timeline
From disclosure to observed exploitation
-
Public PoC available
Public proof-of-concept code published
-
Nuclei template available
Scanner coverage available
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2025-53771
Free JSON includes basic KEV fields{
"cve_id": "CVE-2025-53771",
"confidence": null,
"cvss_score": 6.5,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": false,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}