CVE-2026-56164
Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability - [Actively Exploited]
Description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
INFO
Published Date :
July 14, 2026, 5:17 p.m.
Last Modified :
July 14, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Unknown
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56164
Affected Products
The following products are affected by CVE-2026-56164
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | f38d906d-7342-40ea-92c1-6c4a2c6478c8 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Public PoC/Exploit Available at Github
CVE-2026-56164 has a 7 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-56164.
| URL | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 | Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-56164 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-56164
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
End-to-end technical analysis and reproduction notes for high-impact CVEs (e.g., pre-auth RCEs, sandbox escapes, and privilege escalations).
CVE-2026-56164 EOP Exploit
An operational threat hunting and detection suite. Maps network and host log queries directly to the MITRE ATT&CK framework, featuring an evidence-driven attribution engine that dynamically correlates indicators to state-sponsored threat actors.
HTML CSS JavaScript
Panel de ciberamenazas que se actualiza solo: nuevas amenazas y vulnerabilidades activas cada 6 horas.
CSS Python HTML JavaScript
None
Ruby Shell Python
None
Python
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-56164 vulnerability anywhere in the article.
-
security.nl
Honderden Microsoft SharePoint-servers bevatten actief misbruikte lekken
Honderden Microsoft SharePoint-servers die vanaf het internet toegankelijk zijn bevatten bekende kwetsbaarheden waar aanvallers op dit moment actief misbruik van maken. Het gaat ook om 25 SharePoint-s ... Read more
-
The Hacker News
Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC
A third SharePoint Server flaw patched by Microsoft as part of its Patch Tuesday update for July 2026 has come under active exploitation, per watchTowr. The vulnerability in question is CVE-2026-50522 ... Read more
-
The Cyber Express
The Cyber Express Weekly Roundup: TikTok Age Verification Probe, Healthcare Data Breach, Qantas Ruling, and Major Cyberattacks
This week’s cybersecurity roundup highlights growing concerns around online child safety, healthcare data protection, supply chain risks, and cyber threats affecting organizations worldwide. From regu ... Read more
-
security.nl
Microsoft meldt alsnog actief misbruik van kritiek SharePoint-lek
Een kritieke kwetsbaarheid in Microsoft SharePoint waardoor aanvallers SharePoint-servers op afstand kunnen overnemen is toch wel actief bij aanvallen misbruikt voordat een beveiligingsupdate beschikb ... Read more
-
The Hacker News
CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a newly patched security flaw impacting Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) cata ... Read more
-
Kaspersky
Key vulnerabilities of Microsoft’s July 2026 Patch Tuesday
Although experts had already warned of an impending “tsunami of vulnerabilities” back in April, immediately following the announcement of the Mythos AI model, concrete evidence began to emerge over th ... Read more
-
The Hacker News
Researcher Drops New Windows Zero-Day PoC Hours After Microsoft Patch Tuesday
Security researcher Chaotic Eclipse (aka Nightmare-Eclipse) has released a new proof-of-concept (PoC) exploit called LegacyHive. It has been described as a Windows User Profile Service arbitrary hive ... Read more
-
The Cyber Express
Microsoft’s Largest Patch Tuesday Fixes 622 Vulnerabilities, Two Under Active Attack
Microsoft Patch Tuesday July 2026 delivered the company’s largest security update to date, addressing 622 Microsoft CVEs, more than tripling the roughly 200 vulnerabilities patched in June. Among the ... Read more
-
security.nl
Microsoft komt met grootste Patch Tuesday ooit: 622 kwetsbaarheden gefixt
Microsoft heeft gisteren tijdens Patch Tuesday het grootste aantal kwetsbaarheden ooit verholpen, namelijk 622. Het techbedrijf liet een aantal dagen geleden weten dat klanten en gebruikers als gevolg ... Read more
-
security.nl
Microsoft SharePoint-servers aangevallen, VS roept op tot extra beveiliging
Aanvallers maken actief misbruik van verschillende kwetsbaarheden voor het aanvallen van Microsoft SharePoint-servers, zo waarschuwt het Amerikaanse cyberagentschap CISA. Dat roept organisaties op om ... Read more
-
CrowdStrike.com
July 2026 Patch Tuesday: Microsoft Patches 622 Vulnerabilities Including Two Exploited Zero-Days
Microsoft has addressed 622 vulnerabilities in its July 2026 security update release. Based on CrowdStrike’s analysis, this represents roughly triple the number of vulnerabilities in June, and almost ... Read more
-
The Hacker News
Microsoft Patches Record 622 Flaws, Including Two Zero-Days Under Active Attack
Microsoft shipped its largest Patch Tuesday on record today, and two of the fixes close holes that attackers are already exploiting. The release covers 622 of Microsoft's own CVEs by its Security Upda ... Read more
The following table lists the changes that have been made to the
CVE-2026-56164 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:* *cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* versions up to (excluding) 16.0.19725.20434 Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 Types: Vendor Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 14, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164 Added SSVC {'id': 'CVE-2026-56164', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-14T18:45:11.388695Z'} -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Jul. 14, 2026
Action Type Old Value New Value Added Date Added 2026-07-14 Added Due Date 2026-07-14 Added Required Action 2026-07-14 Added Vulnerability Name 2026-07-14 -
New CVE Received by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Enterprise Server 2016', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.5561.1001', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Server 2019', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.10417.20175', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Server Subscription Edition', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.19725.20434', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}] Added Description Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-306 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164