Insecure Direct Object Reference in Moodle OpenAI Chat Block Plugin

CVE-2025-60511

What is CVE-2025-60511?

The Moodle OpenAI Chat Block plugin version 3.0.1 suffers from an Insecure Direct Object Reference (IDOR) vulnerability caused by inadequate validation of the blockId parameter in the API endpoint /blocks/openai_chat/api/completion.php. This issue allows an authenticated student to impersonate another user's block, such as that of an administrator, enabling them to send queries executed under the configuration of that block. As a result, sensitive administrator-only data may be exposed, the behavior of the model could be tampered with, and API resources may be misused.

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