CVE-2026-12257 in Mura
Summary
by MITRE • 07/13/2026
Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability. The flaw is located in the endpoint “/index.cfm/_api/json/v1/default”, where the “method” parameter in POST requests is not properly validated or sanitised before being processed by the ColdFusion engine. As a result, a remote attacker could exploit this vulnerability to inject and execute arbitrary CFML (ColdFusion Markup Language) expressions and instantiate malicious Java objects, thereby compromising the system’s security.
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Analysis
by VulDB Data Team • 07/13/2026
The vulnerability in Mura CMS versions prior to 10.0.712 represents a critical remote code execution flaw that directly targets the application's API endpoint at /index.cfm/_api/json/v1/default. This endpoint serves as a crucial interface for the ColdFusion-based content management system, making it an attractive target for attackers seeking to compromise the entire platform. The vulnerability stems from insufficient input validation and sanitization of the method parameter within POST requests, creating a path for malicious actors to inject arbitrary code directly into the ColdFusion execution environment. The flaw falls under CWE-94, which specifically addresses the execution of arbitrary code due to improper validation of untrusted data, and aligns with ATT&CK technique T1059.007 for execution through scripting languages in a web application context.
The technical exploitation of this vulnerability occurs when an attacker submits a malicious POST request containing a specially crafted method parameter value that bypasses normal input filtering mechanisms. The ColdFusion engine processes this unvalidated parameter directly without proper sanitization, allowing the execution of arbitrary CFML code and Java object instantiation. This creates a complete compromise of the server environment where Mura CMS is deployed, as attackers can leverage the application's privileges to perform operations such as file system access, database queries, and command execution on the underlying operating system. The vulnerability's impact extends beyond simple data theft to include full system compromise, making it particularly dangerous for organizations relying on Mura CMS for their digital infrastructure.
The operational consequences of this vulnerability are severe and far-reaching for any organization running affected Mura CMS versions. Attackers can gain persistent access to the compromised systems, potentially using the vulnerability as a foothold for further network exploration and lateral movement. The ability to execute arbitrary code means that threat actors can deploy malware, establish backdoors, or exfiltrate sensitive data without detection. Organizations may face regulatory compliance violations, financial losses, and reputational damage if their systems are compromised through this vulnerability. The attack surface is particularly concerning because the API endpoint is often accessible from external networks, making it possible for attackers to exploit the flaw remotely without requiring physical access or prior authentication credentials.
Mitigation of this vulnerability requires immediate action from affected organizations, including applying the patched version 10.0.712 or later releases provided by Mura CMS. System administrators should also implement network-level protections such as firewall rules that restrict access to the vulnerable API endpoint, particularly when external access is not required for legitimate business operations. Additional defensive measures include implementing web application firewalls with rules specifically designed to detect and block malicious method parameter values, conducting thorough security assessments of the application's API endpoints, and monitoring system logs for suspicious activity patterns. Organizations should also consider implementing principle of least privilege configurations for the CMS application, ensuring that it operates with minimal necessary permissions to reduce the potential impact of successful exploitation attempts. The vulnerability highlights the critical importance of proper input validation in web applications and demonstrates how inadequate sanitization can lead to complete system compromise.