Is CVE-2026-56164 actively exploited?

Yes. KEV Intelligence tracks CVE-2026-56164 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2026-56164. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-56164 affects Microsoft Microsoft SharePoint Enterprise Server 2016 and 2 other products. Reported affected versions include 16.0.0 to < 16.0.5561.1001, 16.0.0 to < 16.0.10417.20175, and 16.0.0 to < 16.0.19725.20434.

Yes. CVE-2026-56164 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 11 hours ahead of CISA.

CVE-2026-56164 Exploited in the Wild — Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition

Q: What is CVE-2026-56164?

CVE-2026-56164 is an unauthenticated Microsoft SharePoint Server Elevation of Privilege Vulnerability. Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2026-56164 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 11 hours ahead of CISA.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-56164 is an unauthenticated Microsoft SharePoint Server Elevation of Privilege Vulnerability. Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Microsoft SharePoint Enterprise Server 2016 affected before 16.0.5561.1001.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Vendor Product Affected Status

Microsoft Microsoft SharePoint Enterprise Server 2016 Before 16.0.5561.1001 Affected

Microsoft Microsoft SharePoint Server 2019 Before 16.0.10417.20175 Affected

Microsoft Microsoft SharePoint Server Subscription Edition Before 16.0.19725.20434 Affected

View vendor advisory

Published: 14 Jul 2026
Exploitation Reported: 14 Jul 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-56164
Microsoft SharePoint Server Elevation of Privilege Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Microsoft CVRF

Recorded 14 Jul 2026

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

GitHub

Recorded 15 Jul 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
Microsoft CVRF First	2026-07-14 07:00 UTC
CISA	2026-07-14 17:38 UTC
CVE	2026-07-14 19:02 UTC
Tenable Blog	2026-07-14 19:20 UTC
All CISA Advisories	2026-07-14 19:21 UTC
Rapid7	2026-07-14 22:20 UTC
Daily CyberSecurity	2026-07-15 01:05 UTC
CERT-EU	2026-07-23 09:13 UTC

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

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

5.3 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C

EPSS

22.4%

Weaknesses

Missing Authentication for Critical Function CWE-306

Recent mention · CERT-EU

2026-009: Critical Vulnerabilities in Microsoft SharePoint

[UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of...

Read full advisory

All Mentions

Recent mention · CERT-EU

2026-009: Critical Vulnerabilities in Microsoft SharePoint

CERT-EU · 23 Jul 2026

[UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of CVE-2026-50522, a vulnerability part of an ongoing series of actively exploited flaws affecting on-premise SharePoint Server instances, including CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644. CERT-EU strongly recommends updating affected servers immediately, rotating credentials for any assets...

Recent mention · Tenable Blog

CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

Tenable Blog · 16 Jul 2026

Four Microsoft SharePoint Server vulnerabilities are under active exploitation, prompting CISA to issue a hardening alert. An additional high-severity flaw recently patched adds pressure for organizations running on-premises deployments.Key TakeawaysCISA confirmed active exploitation of three on-premises SharePoint Server vulnerabilities (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164), used to gain unauthorized access, establish remote code execution, steal IIS machine keys and deploy malware for persistence.Two additional SharePoint Server vulnerabilities disclosed on July 14, 2026,...

Recent mention · Daily CyberSecurity

CISA Warns Three SharePoint Server Vulnerabilities Are Exploited in the Wild, Urges Hardening

Daily CyberSecurity · 15 Jul 2026

TL;DR CISA has confirmed active exploitation of three SharePoint vulnerabilities: CVE-2026-32201, CVE-2026-45659, and CVE-2026-56164. Threat actors chain them The post CISA Warns Three SharePoint Server Vulnerabilities Are Exploited in the Wild, Urges Hardening appeared first on Daily CyberSecurity.

Recent mention · Rapid7

Patch Tuesday - July 2026

Rapid7 · 14 Jul 2026

Microsoft is publishing 622 vulnerabilities on July 2026 Patch Tuesday, including a record-breaking 416 Windows vulnerabilities. Microsoft is aware of exploitation in the wild for two of the vulnerabilities published today, both of which are listed on CISA KEV, as well as public disclosure for one other. As usual, browser vulns are not included in the Patch Tuesday count above. Rapid7 noted last month that Microsoft no longer enumerates Chromium CVEs in the Security Update Guide. However, Microsoft has now taken the pursuit of minimalism much further, since today’s Security Update Guide no...

Recent mention · Tenable Blog

Microsoft’s July 2026 Patch Tuesday Addresses 569 CVEs (CVE-2026-56155, CVE-2026-56164)

Tenable Blog · 14 Jul 2026

56Critical510Important3Moderate0LowMicrosoft addresses 569 CVEs in the largest Patch Tuesday release yet. This month’s release includes three zero-days, two of which were exploited in the wild.Microsoft patched 569 CVEs in its July 2026 Patch Tuesday release, with 56 rated critical, 510 rated as important, and 3 rated as moderate. This marks the largest Patch Tuesday release ever, crushing the previous record of 198 CVEs in June. Last week, Microsoft announced that its multi-model agentic scanning harness (MDASH) is being used to identify vulnerabilities faster and noted that “customers...

Recent mention · All CISA Advisories

CISA Urges SharePoint Hardening After New Exploitations

All CISA Advisories · 14 Jul 2026

CISA is aware of active exploitation of vulnerabilities CVE-2026-32201, CVE-2026-45659, and CVE-2026-56164, enabling cyber threat actors to gain unauthorized access to on-premises SharePoint Server instances. These vulnerabilities affect all supported on-premises SharePoint Server versions (Subscription Edition, 2019, and 2016) and involve establishing remote code execution (RCE) and post-exploitation activities, such as stealing Internet Information Services (IIS) machine keys and performing deserialization techniques, to gain persistence and deploy malware. Organizations should monitor...

Recent mention · All CISA Advisories

CISA Adds Four Known Exploited Vulnerabilities to Catalog

All CISA Advisories · 14 Jul 2026

CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-15409 SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability CVE-2026-15410 SonicWall SMA1000 Appliances Code Injection Vulnerability CVE-2026-56155 Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability CVE-2026-56164 Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

sam00/POC-CVE-2026-56164-exploit

github · Created 2026-08-06 13:30:07 UTC · 0 stars · AI assessment 90%

CVE-2026-56164 is a critical missing-authentication vulnerability affecting on-premises Microsoft SharePoint Server. It allows unauthenticated, remote attackers to elevate privileges over a network.

Timeline

From disclosure to observed exploitation

06 Aug 2026
Public PoC available

Public proof-of-concept code published
23 Jul 2026
KEV confirmed by CERT-EU

Exploitation attested by an external source
15 Jul 2026
KEV confirmed by Daily CyberSecurity

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by Rapid7

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by All CISA Advisories

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by Tenable Blog

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by CVE

Exploitation attested by an external source
14 Jul 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
14 Jul 2026
CVE published

Vulnerability disclosed publicly
14 Jul 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
19 Jun 2026
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.

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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-2026-56164

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-56164",
  "confidence": "Confirmed",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.22439,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-56164

What security teams need to know first

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Proof of concept available

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Severity, weaknesses, and research context

Weaknesses

2026-009: Critical Vulnerabilities in Microsoft SharePoint

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Public PoC available

KEV confirmed by CERT-EU

KEV confirmed by Daily CyberSecurity

KEV confirmed by Rapid7

KEV confirmed by All CISA Advisories

KEV confirmed by Tenable Blog

KEV confirmed by CVE

Added to CISA KEV

CVE published

Added to KEV Intelligence KEV Feed

CVE ID reserved

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