CVE-2026-61643: CWE-863: Incorrect Authorization in labring FastGPT
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.
AI Analysis
Technical Summary
CVE-2026-61643 is an incorrect authorization vulnerability (CWE-863) in labring's FastGPT platform affecting versions from 4.14.17 until 4.15.0-beta5. The flaw allows an authenticated user to save a workflow node that references another user's private HTTP toolset by using a specially crafted tool ID. While normal toolset routes enforce access restrictions, the workflow save and runtime paths do not apply the same authorization checks, enabling the API endpoint /api/v2/chat/completions to resolve and execute the referenced victim-owned HTTP tool. This can lead to unauthorized execution of another user's private tools. The vulnerability is fixed in version 4.15.0-beta5.
Potential Impact
An authenticated user with low privileges can bypass authorization controls to execute HTTP tools owned by other users. This results in unauthorized execution of victim-owned HTTP tools, impacting integrity and confidentiality of user resources. The CVSS score is 5.9 (medium severity), reflecting limited attack complexity but significant impact on integrity.
Mitigation Recommendations
Upgrade FastGPT to version 4.15.0-beta5 or later, where this authorization issue is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed beyond the fixed version, so verify with vendor advisories for the latest guidance.
CVE-2026-61643: CWE-863: Incorrect Authorization in labring FastGPT
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.
CVSS v3.1
Score 5.9medium
Affected software
pkg:github/labring/FastGPTRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61643 is an incorrect authorization vulnerability (CWE-863) in labring's FastGPT platform affecting versions from 4.14.17 until 4.15.0-beta5. The flaw allows an authenticated user to save a workflow node that references another user's private HTTP toolset by using a specially crafted tool ID. While normal toolset routes enforce access restrictions, the workflow save and runtime paths do not apply the same authorization checks, enabling the API endpoint /api/v2/chat/completions to resolve and execute the referenced victim-owned HTTP tool. This can lead to unauthorized execution of another user's private tools. The vulnerability is fixed in version 4.15.0-beta5.
Potential Impact
An authenticated user with low privileges can bypass authorization controls to execute HTTP tools owned by other users. This results in unauthorized execution of victim-owned HTTP tools, impacting integrity and confidentiality of user resources. The CVSS score is 5.9 (medium severity), reflecting limited attack complexity but significant impact on integrity.
Mitigation Recommendations
Upgrade FastGPT to version 4.15.0-beta5 or later, where this authorization issue is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed beyond the fixed version, so verify with vendor advisories for the latest guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-10T17:38:57.112Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57c45668715ace431fc1e3
Added to database: 07/15/2026, 17:33:10 UTC
Last enriched: 07/22/2026, 22:39:53 UTC
Last updated: 08/29/2026, 17:03:34 UTC
Views: 71
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