Microsoft SharePoint Server Remote Code Execution Vulnerability (CVE-2024-38094) Technical Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft SharePoint Server 2016, 2019, and Subscription Edition
An authorized attacker with Site Owner permissions can execute arbitrary code within the server context via specially crafted API requests, leading to full system compromise
Apply the official Microsoft Cumulative Update (CU) patches immediately, restrict administrative privileges, and audit system logs for indicators of compromise
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Refer to the Microsoft Security Update Guide to download and apply the appropriate Cumulative Update (CU) for your SharePoint version. Use the following PowerShell command to verify your current SharePoint farm build version:
# Run in SharePoint Management Shell to check the current build version
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
(Get-SPFarm).BuildVersion2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict administrative and Site Owner privileges to trusted personnel only. Additionally, implement IIS URL Rewrite rules to restrict access to sensitive API endpoints from untrusted networks.
<!-- Example IIS web.config rule to restrict API access to internal IP ranges -->
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name='Restrict_API_Access' stopProcessing='true'>
<match url='_api/.*' />
<conditions>
<add input='{REMOTE_ADDR}' pattern='^10\.0\.' negate='true' />
</conditions>
<action type='CustomResponse' statusCode='403' statusReason='Forbidden' statusDescription='Access Denied' />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>3. Log Audit & IoC Verification Commands
Inspect SharePoint ULS (Unified Logging Service) logs and IIS logs for anomalous POST requests or deserialization errors. The following PowerShell script searches ULS logs for deserialization-related exceptions:
# Query ULS logs for deserialization errors and exceptions over the last 7 days
Get-SPLogEvent -StartTime (Get-Date).AddDays(-7) | Where-Object { $_.Message -like '*deserialize*' -or $_.Message -like '*TypeInitializationException*' } | Format-Table Timestamp, Area, Category, EventID, Message -AutoSizeBlock Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
CVE-2024-38094 is a critical Remote Code Execution (RCE) vulnerability in Microsoft SharePoint Server. The root cause lies in the deserialization of untrusted data (CWE-502). When processing specific serialized objects or API payloads, SharePoint fails to properly validate the input, allowing an attacker to trigger unsafe deserialization within the .NET CLR (Common Language Runtime) environment.
2. Exploitation Mechanics & Attack Scenario
To exploit this vulnerability, an attacker must first authenticate and possess Site Owner or higher privileges (PR:H). The attacker then transmits a crafted payload containing serialized objects to a vulnerable SharePoint endpoint. Upon deserialization, the server executes the embedded malicious code under the security context of the SharePoint service account. This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog.
3. Infrastructure & Business Impact
Successful exploitation grants the attacker arbitrary code execution capabilities on the hosting server. This can lead to unauthorized access to sensitive corporate data, lateral movement within the Active Directory domain, deployment of ransomware, and persistent backdoor installation, posing severe risks to business continuity and data confidentiality.
Official Vendor Advisories & References
Microsoft SharePoint Remote Code Execution Vulnerability
Frequently Asked SecOps Questions (CVE-2024-38094)
FAQQ1. How critical is CVE-2024-38094 and is it actively exploited in the wild?
CVE-2024-38094 is rated CVSS 7.2 (HIGH) with a 30-day EPSS exploitation probability of 50.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-38094?
Primary impacted vendors include microsoft across sharepoint, sharepoint_server. Scope summary: Microsoft SharePoint Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition (requires Site Owner privileges)
Q3. What temporary mitigations or workarounds exist for CVE-2024-38094 before patching?
[Mitigation] Apply the official Microsoft Cumulative Update (CU) patches immediately, restrict administrative privileges, and audit system logs for indicators of compromise Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2024-38094
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (microsoft)
View Category →Microsoft SharePoint Server Remote Code Execution (RCE) Vulnerability Advisory (CVE-2026-58644, CWE-502)
[Affected Scope] Microsoft SharePoint Server deployments
Microsoft SharePoint Remote Code Execution (RCE) Vulnerability Advisory (CVE-2026-50522, CWE-502)
[Affected Scope] Microsoft SharePoint Server deployments
Microsoft SharePoint Server Remote Code Execution (RCE) Vulnerability Advisory (CVE-2026-45659, CWE-502)
[Affected Scope] Microsoft SharePoint Server deployments
Microsoft Office SharePoint Missing Authentication Privilege Escalation Vulnerability (CVE-2026-56164) Security Advisory
[Affected Scope] Microsoft Office SharePoint Server environments
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.