CVE-2025-49704: Microsoft SharePoint Server RCE Vulnerability

CVE-2025-49704 Overview

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network. This vulnerability is classified as high severity due to its potential impact, scoring 8.8 on the CVSS scale.

Critical Impact
Authorized attackers can execute arbitrary code, compromising data integrity and availability.

Affected Products

Microsoft SharePoint Server 2016
Microsoft SharePoint Server 2019

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Microsoft
Not Available - CVE CVE-2025-49704 assigned
Not Available - Microsoft releases security patch
2025-07-08 - CVE CVE-2025-49704 published to NVD
2025-10-27 - Last updated in NVD database

Technical Details for CVE-2025-49704

Vulnerability Analysis

The vulnerability arises from improper handling of code generation within Microsoft Office SharePoint, enabling an attacker with existing access to inject malicious code. This flaw permits actions that could escalate privileges and allow further unauthorized access. The flaw is particularly dangerous when exploited over the network context, given the broad surface area that can be affected.

Root Cause

The root cause is a failure in input validation when generating and executing code via SharePoint interfaces, specifically failing to properly sanitize inputs under certain conditions.

Attack Vector

The attack vector is network-based, allowing remote attackers with necessary permissions to exploit the code injection vulnerability.

python

# Example exploitation code (sanitized)
def exploit():
    payload = "<malicious_code>"
    send_code_injection(payload)
    execute_payload_remotely()

Detection Methods for CVE-2025-49704

Indicators of Compromise

Unusual outbound network traffic
Anomalous process activity on SharePoint servers
Presence of unfamiliar scripts or binaries

Detection Strategies

Implement network traffic analysis to detect anomalous patterns typical of exploitation attempts. Use endpoint detection tools to identify unusual process activity and unauthorized script execution.

Monitoring Recommendations

Regularly audit SharePoint server logs for unauthorized access attempts and code execution activities. Use SIEM systems for real-time alerting on identified Indicators of Compromise.

How to Mitigate CVE-2025-49704

Immediate Actions Required

Apply the latest security patches from Microsoft
Restrict access to SharePoint to trusted networks and users
Utilize application whitelisting to prevent unauthorized code execution

Patch Information

Patches have been released by Microsoft and can be obtained through their advisory page: Microsoft Advisory

Workarounds

Configuring strict validation and sanitization measures on input fields in SharePoint can help mitigate risk.

bash

# Configuration example
sed -i 's/ALLOW_ORIGINS=/ALLOW_ORIGINS=https:\/\/trusted\.domain\.com/' /etc/sharepoint/config