Kentico Xperience Staging Sync Server Authentication Bypass and Remote Code Execution (CVE-2025-2747)
Executive & SecOps Summary
SECOPS ASSESSMENTKentico Xperience through version 13.0.178 with Staging Sync Server enabled
Unauthenticated attackers can bypass authentication to control administrative objects, leading to full Remote Code Execution (RCE)
Apply the official Kentico hotfix immediately and restrict external access to the Staging Sync Server endpoint
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official hotfix provided by Kentico. If you manage dependencies via NuGet, update your project packages to version 13.0.179 or higher using the Package Manager Console:
# Update Kentico Xperience packages via NuGet Package Manager Console
Update-Package Kentico.Xperience.AspNetCore-WebApp -Version 13.0.179
Update-Package Kentico.Xperience.Libraries -Version 13.0.1792. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict access to the Staging Sync Server endpoint ('/CMSPages/Staging/SyncServer.asmx') using IIS URL Rewrite rules to allow only trusted IP addresses:
<!-- Add this rule inside the <system.webServer> section of your web.config -->
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name='Restrict Staging Sync Access' stopProcessing='true'>
<match url='^CMSPages/Staging/SyncServer\.asmx' />
<conditions>
<!-- Replace with your trusted internal IP range -->
<add input='{REMOTE_ADDR}' pattern='^192\.168\.' 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
Search IIS access logs for suspicious POST requests targeting the Staging Sync Server endpoint to identify potential exploitation attempts:
# PowerShell command to scan IIS logs for access to the vulnerable endpoint
$LogDirectory = 'C:\inetpub\logs\LogFiles\W3SVC1\*'
Get-ChildItem -Path $LogDirectory -Filter *.log |
Select-String -Pattern 'POST /CMSPages/Staging/SyncServer.asmx' |
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
An authentication bypass vulnerability exists in the Staging Sync Server component of Kentico Xperience. The root cause lies in the password handling logic for server definitions configured with the 'None' authentication type (CWE-288). Due to this flaw, the application fails to properly validate credentials when processing synchronization requests under specific configurations, allowing unauthorized access.
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by sending a crafted XML-RPC or SOAP request to the exposed Staging Sync Server endpoint. By specifying the authentication type as 'None', the attacker bypasses the password verification routine entirely. Once authenticated, the attacker gains administrative control over staging objects, which can be chained with template execution or file upload capabilities to achieve pre-authentication Remote Code Execution (RCE).
3. Infrastructure & Business Impact
This vulnerability has been assigned a CVSS score of 9.8 (Critical) and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Successful exploitation allows complete compromise of the underlying web server, enabling attackers to exfiltrate sensitive databases, deploy ransomware, or pivot into the internal corporate network.
Official Vendor Advisories & References
An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync Server component password handling for the server defined None type. Authentication bypass allows an attacker to control administrative objects.This issue affects Xperience through 13.0.178.
Frequently Asked SecOps Questions (CVE-2025-2747)
FAQQ1. How critical is CVE-2025-2747 and is it actively exploited in the wild?
CVE-2025-2747 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 97.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-2747?
Primary impacted vendors include kentico across xperience. Scope summary: All installations of Kentico Xperience up to and including version 13.0.178
Q3. What temporary mitigations or workarounds exist for CVE-2025-2747 before patching?
[Mitigation] Apply the official Kentico hotfix immediately and restrict external access to the Staging Sync Server endpoint 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-2025-2747
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