CVE-2026-61643: CWE-863: Incorrect Authorization in labring FastGPT
FastGPT versions from 4.14.17 up to but not including 4.15.0-beta5 contain an authorization vulnerability. An authenticated user can save a workflow node referencing another user's private HTTP toolset by crafting a saved tool ID. While normal toolset routes enforce access control, the workflow save and runtime paths do not, allowing execution of victim-owned HTTP tools via the /api/v2/chat/completions endpoint. 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. The normal access control checks are bypassed in the workflow save and runtime paths, enabling the /api/v2/chat/completions API to resolve and execute the victim's HTTP tool without proper authorization. The vulnerability is resolved in version 4.15.0-beta5.
Potential Impact
The vulnerability allows an authenticated user with low privileges to execute HTTP tools owned by other users without proper authorization. This can lead to unauthorized use of victim-owned resources and potentially impact the integrity of workflows. Confidentiality impact is low, integrity impact is high, and availability is not affected. The CVSS v3.1 score is 5.9 (medium severity).
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 stated but the fix is included starting with 4.15.0-beta5.
CVE-2026-61643: CWE-863: Incorrect Authorization in labring FastGPT
Description
FastGPT versions from 4.14.17 up to but not including 4.15.0-beta5 contain an authorization vulnerability. An authenticated user can save a workflow node referencing another user's private HTTP toolset by crafting a saved tool ID. While normal toolset routes enforce access control, the workflow save and runtime paths do not, allowing execution of victim-owned HTTP tools via the /api/v2/chat/completions endpoint. 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. The normal access control checks are bypassed in the workflow save and runtime paths, enabling the /api/v2/chat/completions API to resolve and execute the victim's HTTP tool without proper authorization. The vulnerability is resolved in version 4.15.0-beta5.
Potential Impact
The vulnerability allows an authenticated user with low privileges to execute HTTP tools owned by other users without proper authorization. This can lead to unauthorized use of victim-owned resources and potentially impact the integrity of workflows. Confidentiality impact is low, integrity impact is high, and availability is not affected. The CVSS v3.1 score is 5.9 (medium severity).
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 stated but the fix is included starting with 4.15.0-beta5.
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: 07/15/2026, 17:48:29 UTC
Last updated: 07/15/2026, 17:48:29 UTC
Views: 4
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