MindsDB Unrestricted File Upload Vulnerability (CVE-2026-7711)

A critical vulnerability, CVE-2026-7711, exists in MindsDB, an open-source machine learning platform, up to version 26.01. This flaw resides within the exec function of the mindsdb/integrations/handlers/byom_handler/proc_wrapper.py file, a component of the Engine Handler. The vulnerability allows a remote attacker to perform unrestricted file uploads due to a lack of input validation. Public exploits are available, making exploitation more likely. Successful exploitation could lead to arbitrary code execution on the MindsDB server, potentially compromising the entire system and any data it manages. The vendor was notified but has not responded.

Attack Chain

1. The attacker identifies a MindsDB instance running a vulnerable version (<= 26.01).
2. The attacker crafts a malicious request targeting the exec function within mindsdb/integrations/handlers/byom_handler/proc_wrapper.py.
3. This request includes a payload designed to bypass any existing file type or size restrictions.
4. The vulnerable exec function processes the request without proper validation.
5. The attacker uploads an arbitrary file, such as a web shell or a malicious executable, to a writeable directory on the server.
6. The attacker executes the uploaded file, gaining code execution on the server.
7. The attacker leverages the gained access to escalate privileges, move laterally within the network, and potentially exfiltrate sensitive data or install malware.

Impact

Successful exploitation of CVE-2026-7711 can have severe consequences. An attacker could gain complete control over the MindsDB server, potentially leading to data breaches, service disruption, or further malicious activities within the affected network. Given the nature of MindsDB as a machine learning platform, the data stored or processed by it is highly sensitive, increasing the potential damage. Without remediation, any instance running an affected version is susceptible to remote compromise.

Recommendation

• Upgrade MindsDB to a version greater than 26.01 to remediate CVE-2026-7711.
• Deploy the Sigma rule “Detect MindsDB Unrestricted Upload Attempt” to identify exploitation attempts targeting the vulnerable exec function.
• Monitor web server logs for suspicious POST requests containing file uploads to paths associated with the byom_handler.
• Implement strict file upload restrictions and validation on the MindsDB server, even after patching, as a defense-in-depth measure.