Ethansilvas

**Name of the Vulnerable Software and Affected Versions** Langflow versions prior to 1.0.19 **Description** An unauthenticated attacker can cause a denial of service by sending a request to the '/api/v1/files/upload/' endpoint without authentication tokens or cookies. By abusing a very long multipart form boundary, such as including an extremely large amount of hyphens, the application attempts to process the malformed data before performing authentication or flow-ownership checks. This process can make the application unusable for all users for an indefinite period. The attack does not require a valid flow UUID, as the server attempts to process the boundary regardless of the value provided. **Recommendations** Update to version 1.0.19.

**Name of the Vulnerable Software and Affected Versions** Langflow versions prior to 1.9.0 **Description** The `/api/v1/monitor` router exposes seven endpoints that allow read, write, and delete operations on user-owned resources, including messages, sessions, build artifacts, and LLM transaction logs. The system fails to verify if the authenticated requester owns the targeted resource, leading to an Insecure Direct Object Reference (IDOR), also known as Broken Object Level Authorization (BOLA). An authenticated user can read, modify, rename, or permanently delete another user's data by providing the target's resource ID or `flow id`. Technical details include the following vulnerable endpoints: - 'GET /api/v1/monitor/builds' and 'DELETE /api/v1/monitor/builds' using the `flow id` variable. - 'DELETE /api/v1/monitor/messages' using the `message ids` variable. - 'PUT /api/v1/monitor/messages/{message id}' using the `message id` variable. - 'PATCH /api/v1/monitor/messages/session/{old session id}' using the `old session id` variable. - 'DELETE /api/v1/monitor/messages/session/{session id}' using the `session id` variable. - 'GET /api/v1/monitor/transactions' using the `flow id` variable. **Recommendations** Update to version 1.9.0. As a temporary workaround, restrict access to the `/api/v1/monitor` endpoints to minimize the risk of unauthorized data access or deletion.