Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Open WebUI. Authentication is required to exploit this vulnerability.

The specific flaw exists within the load_tool_module_by_id function. The issue results from the lack of proper validation of a user-supplied string before using it to execute Python code. An attacker can leverage this vulnerability to execute code in the context of the service account.

10/09/25 – ZDI submitted the report to the vendor’s GitHub account
10/10/25 – the vendor closed the report
10/15/25 – ZDI asked for the reason
11/10/25 – ZDI asked for the fix
12/10/25 – ZDI notified the vendor of the intention to publish the case as a  0-day advisory

-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the product

• 2025-10-09 - Vulnerability reported to vendor
• 2026-01-09 - Coordinated public release of advisory
• 2026-01-09 - Advisory Updated