NVD / CVE Program· CNA microsoft

CVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerability

Noroxi assessment

Priority: This week (action score 69/100)

CISA has confirmed exploitation in the wild (Jul 14, 2026). Remediation deadline for US federal agencies: Jul 17, 2026.
Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 63.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: Microsoft SharePoint Enterprise Server 2016 16.0.5561.1001; Microsoft SharePoint Server 2019 16.0.10417.20175; Microsoft SharePoint Server Subscription Edition 16.0.19725.20434.
Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 9.8.

Don’t wait for the next maintenance window. Upgrade to Microsoft SharePoint Enterprise Server 2016 16.0.5561.1001; Microsoft SharePoint Server 2019 16.0.10417.20175; Microsoft SharePoint Server Subscription Edition 16.0.19725.20434 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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

CriticalCVSS 9.8 · v3.1KEVWeaponized Fix available

Published: Jul 14, 2026
Updated: Nov 10, 2026
EPSS: 1.0% · 63th percentile
CWE: CWE-306

Report tools

JSON

Action score

This week

Don’t wait for the next maintenance window.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 0 / 30 · 1.0%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · microsoft: 5.3; 4.5 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Jul 14, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Jul 17, 2026.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
microsoft	sharepoint server	cpe:2.3:a:microsoft:sharepoint_server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

microsoft sharepoint serverbefore 16.0.19725.20434
microsoft sharepoint server2016
microsoft sharepoint server2019

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

Microsoft Microsoft SharePoint Enterprise Server 2016
- 16.0.0 and later · before 16.0.5561.1001affected
Microsoft Microsoft SharePoint Server 2019
- 16.0.0 and later · before 16.0.10417.20175affected
Microsoft Microsoft SharePoint Server Subscription Edition
- 16.0.0 and later · before 16.0.19725.20434affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2025-53770Microsoft SharePoint Server Remote Code Execution VulnerabilityKEV
99Now
CVE-2023-29357Microsoft SharePoint Server Elevation of Privilege VulnerabilityKEV
99Now
CVE-2025-49704Microsoft SharePoint Remote Code Execution VulnerabilityKEV
95Now

Published before and after this one in the same product

← EarlierCVE-2026-50522Jul 14, 2026 · Microsoft SharePoint Remote Code Execution VulnerabilityKEV
70This week
← EarlierCVE-2026-54108Jul 14, 2026 · Microsoft SharePoint Server Spoofing Vulnerability
26Monitor
Later →CVE-2026-58644Jul 14, 2026 · Microsoft SharePoint Remote Code Execution VulnerabilityKEV
74This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Microsoft SharePoint Enterprise Server 2016	16.0.5561.1001 · KB5002891	Microsoft (MSRC)
Microsoft SharePoint Server 2019	16.0.10417.20175 · KB5002883	Microsoft (MSRC)
Microsoft SharePoint Server Subscription Edition	16.0.19725.20434 · KB5002882	Microsoft (MSRC)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:12	2026-07-15
Proof-of-concept repository on GitHub	stars:2	2026-08-06

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

CISA KEVJul 14, 2026-1 d
PublishedJul 14, 2026
First PoCJul 15, 2026same day
TodayNov 11, 2026+120 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-6492128 days apartMicrosoft SharePoint Server Elevation of Privilege Vulnerability
35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2026-6351428 days apartMicrosoft SharePoint Server Remote Code Execution Vulnerability
36Monitor
CVE-2026-6680528 days apartMicrosoft SharePoint Server Remote Code Execution Vulnerability
36Monitor
CVE-2026-541080 days apartMicrosoft SharePoint Server Spoofing Vulnerability
26Monitor
CVE-2026-550510 days apartMicrosoft SharePoint Server Information Disclosure Vulnerability
26Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1// Added for the support team
2app.post("/maintenance/reset", resetDevice);

Fixed

1if (config.maintenanceEnabled) {
2  app.post(
3    "/maintenance/reset",
4    requireSession, requireRole("admin"), resetDevice
5  );
6}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 30, 2026, 3:28 AM UTC

For records you follow, these changes also arrive as notifications. →

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164

Show all references (1 more)

www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records