CVE-2026-61643: Labring Fastgpt

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

FastGPT is a knowledge-based AI application platform. From 4.14.17 until 4.15.0-beta5, an authenticated FastGPT user can save a workflow node that points to another user's private HTTP toolset by using a crafted saved tool id such as http-<victim_toolset_app_id>/<tool_name>. The normal toolset routes deny access, but the workflow save and runtime path did not apply the same authorization check to the referenced toolset, allowing /api/v2/chat/completions to resolve the saved reference and execute the victim-owned HTTP tool. This issue is fixed in version 4.15.0-beta5.

Affected products

• Labring Fastgpt: from 4.14.17, before 4.15.0-beta5 (fixed in 4.15.0-beta5)

Published 2026-07-15. Last modified 2026-07-20.