CVE-2025-67843 identifies a Server-Side Template Injection (SSTI) vulnerability in the MDX Rendering Engine component of the Mintlify Platform, a tool used for rendering MDX files which combine Markdown and JSX. The root cause is improper neutralization of special elements in the template engine (CWE-1336), allowing attackers to inject malicious inline JSX expressions. When an attacker submits a crafted MDX file, the rendering engine processes the embedded JSX without sufficient sanitization, enabling arbitrary code execution on the server. This can lead to unauthorized access, data leakage, or manipulation of the platform’s backend environment. The vulnerability affects all versions of Mintlify Platform prior to the 2025-11-15 patch release. Exploitation requires network access and limited privileges (PR:L), but no user interaction is needed, increasing the risk of automated attacks. Although no exploits are publicly known yet, the vulnerability’s characteristics make it a high-risk issue. The CVSS 3.1 base score of 8.3 reflects high confidentiality and integrity impacts, low attack complexity, and no user interaction required. The vulnerability is particularly dangerous in environments where MDX files are uploaded or processed from untrusted sources or where multiple users contribute content. The lack of patch links suggests that organizations must monitor Mintlify’s updates closely and apply fixes promptly once available.

For European organizations, this vulnerability poses a significant threat to the confidentiality and integrity of internal documentation and content management systems that rely on the Mintlify Platform. Successful exploitation could allow attackers to execute arbitrary code on servers, potentially leading to data breaches, unauthorized access to sensitive information, and disruption of services. Organizations in sectors such as finance, healthcare, and government, which often handle sensitive data and rely on secure documentation platforms, are at heightened risk. The ability to execute code remotely without user interaction increases the likelihood of automated exploitation attempts. Additionally, compromised documentation platforms can serve as pivot points for further attacks within corporate networks. The impact on availability is lower but still present due to potential service disruptions caused by malicious code execution. Given the increasing adoption of modern documentation tools in European enterprises, the scope of affected systems could be substantial if patches are not applied promptly.

1. Immediately monitor Mintlify’s official channels for patch releases addressing CVE-2025-67843 and apply updates as soon as they become available. 2. Until patches are applied, restrict MDX file uploads or inputs to trusted users only and implement strict validation and sanitization of MDX content to detect and block inline JSX expressions. 3. Employ runtime application self-protection (RASP) or web application firewalls (WAF) with custom rules to detect and block suspicious template injection patterns targeting the MDX rendering engine. 4. Isolate the Mintlify Platform environment using containerization or sandboxing to limit the impact of potential code execution. 5. Conduct regular security audits and code reviews focusing on template rendering components and input handling. 6. Educate development and content teams about the risks of SSTI and safe content handling practices. 7. Implement robust logging and monitoring to detect anomalous behavior indicative of exploitation attempts. 8. Limit privileges of users who can upload or modify MDX files to minimize attack surface.