CVE-2026-61643 FastGPT: workflow runtime can execute another user's private HTTP toolset
Authenticated users can execute another user's private HTTP tools via crafted workflow references, bypassing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-61643?
CVE-2026-61643 is a medium-severity missing authorization vulnerability in labring FastGPT, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-61643?
How do I fix CVE-2026-61643?
No fix has been published for CVE-2026-61643 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-61643 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61643 exists.
Sources
Also known as GHSA-93r3-wqq3-c5ch.