What is the CVSS score of CVE-2026-26106?

CVE-2026-26106 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-26106?

Within 24 hours: Inventory all SharePoint instances and document authorized user accounts with elevated privileges; audit recent SharePoint access logs for suspicious activity. Within 7 days: Implement network segmentation to restrict SharePoint access to essential business users only; deploy WAF rules to block suspicious input patterns; disable unnecessary SharePoint features and extensions. Within 30 days: Establish a monitored vulnerability tracking process; prepare for rapid deployment once Microsoft releases a patch; conduct security awareness training for SharePoint administrators on social engineering and credential compromise.

Sharepoint Server CVE-2026-26106

HIGH

Improper Input Validation (CWE-20)

2026-03-10 secure@microsoft.com

Information Disclosure Microsoft Sharepoint Server

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as authorized SharePoint user
Exploit

Submit crafted input bypassing validation
Execution

Trigger code execution in SharePoint process
Impact

Execute arbitrary code with application privileges

Vulnerability Assessment

Weakness	CWE CWE-20 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V2 - Validation and Business Logic Input validation, allowlisting
Exploitation Conditions	Attacker must hold valid SharePoint user credentials (PR:L). Vulnerable SharePoint instance with improper input validation in user-accessible features. Default configurations of Microsoft Office SharePoint with standard user authentication enabled.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Remote code execution in Microsoft SharePoint Server allows authenticated users to bypass input validation and execute arbitrary code across the network. This high-severity vulnerability (CVSS 8.8) affects authorized attackers who can leverage improper validation controls to achieve full system compromise. No patch is currently available, making immediate mitigation and access controls critical for affected organizations.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network. [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affected Packages

microsoft sharepoint_enterprise_server_2016_16_0_5543_1000 fix: Microsoft SharePoint Enterprise Server 2016 16.0.5543.1000

microsoft sharepoint_server_2019_16_0_10417_20102 fix: Microsoft SharePoint Server 2019 16.0.10417.20102

microsoft sharepoint_server_subscription_edition_16_0_19725_20076 fix: Microsoft SharePoint Server Subscription Edition 16.0.19725.20076

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in microsoft

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-20 (Improper Input Validation). Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Executive ViewAI

Why It Matters

A high-severity vulnerability in Microsoft Office SharePoint (CVE-2026-26106) allows authorized users to execute arbitrary code remotely, potentially leading to data breach, system compromise, or lateral movement within the organization. This affects all SharePoint deployments and requires immediate attention since no patch is currently available.

Business Impact: High

Compensating Controls

Implement Web Application Firewall (WAF) rules to detect and block malicious input patterns targeting SharePoint; restrict SharePoint access via network segmentation and IP whitelisting to trusted networks only; disable non-essential SharePoint features and web parts; enforce multi-factor authentication (MFA) for all SharePoint users; enhance logging and monitoring for suspicious activities; restrict administrative access to least-privilege accounts; conduct regular audits of user permissions and remove unnecessary elevated access.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS CERT-EU

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.