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CVE-2026-61684— FastGPT: Unauthenticated cross-tenant data access via forgeable plugin-invoke JWT (default INVOKE_TOKEN_SECRET='token')

Quick assessment

Affected
labring FastGPT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

labring FastGPT是labring公司开源的一款基于大语言模型的开源知识库问答系统。 labring FastGPT 4.15.0-beta4版本存在信任管理问题漏洞，该漏洞源于使用硬编码的INVOKE_TOKEN_SECRET常量字符串进行JWT签名验证，导致未经身份验证的攻击者可自签HS256令牌，访问/api/invoke/userInfo暴露跨租户用户PII信息或通过/api/invoke/fileUpload向聊天文件中写入任意内容。

AI Predicted 9.8 Difficulty: Easy EPSS 0.51% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
labring FastGPT = 4.15.0-beta4 affected
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I. Basic Information for CVE-2026-61684

Vulnerability Information
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Vulnerability Title
FastGPT: Unauthenticated cross-tenant data access via forgeable plugin-invoke JWT (default INVOKE_TOKEN_SECRET='token')
Source: CVE Program / CVE List V5
Vulnerability Description
FastGPT is a knowledge-based AI application platform. In 4.15.0-beta4, FastGPT plugin invoke reverse-call endpoints under /api/invoke/* authenticate only by verifying a JWT signed with INVOKE_TOKEN_SECRET, which defaults to the constant string token and was not set in official deployment templates. An unauthenticated attacker can self-sign an HS256 JWT and reach /api/invoke/userInfo to disclose cross-tenant user PII by attacker-supplied tmbId values, or /api/invoke/fileUpload to write attacker-controlled content into chat files. This issue is fixed in version 4.15.0-beta5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5
Vulnerability Title
labring FastGPT 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
labring FastGPT是labring公司开源的一款基于大语言模型的开源知识库问答系统。 labring FastGPT 4.15.0-beta4版本存在信任管理问题漏洞，该漏洞源于使用硬编码的INVOKE_TOKEN_SECRET常量字符串进行JWT签名验证，导致未经身份验证的攻击者可自签HS256令牌，访问/api/invoke/userInfo暴露跨租户用户PII信息或通过/api/invoke/fileUpload向聊天文件中写入任意内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
labring FastGPT = 4.15.0-beta4 -

II. Public POCs for CVE-2026-61684

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III. Intelligence Information for CVE-2026-61684

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Patches & Fixes for CVE-2026-61684 (1)

Vendor Advisories for CVE-2026-61684 (1)

Vendor Pages for CVE-2026-61684 (1)

Same Patch Batch · labring · 2026-07-15 · 5 CVEs total

CVE-2026-61644 7.7 HIGH FastGPT: /api/core/chat/record/getCollectionQuote can disclose cross-tenant dataset text d
CVE-2026-61643 5.9 MEDIUM FastGPT: workflow runtime can execute another user's private HTTP toolset
CVE-2026-61646 FastGPT: Shared axios SSRF guard validates only the initial URL before following redirects
CVE-2026-50562 FastGPT: Untrusted PR artifacts are pushed and deployed by privileged preview workflows

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-798

V. Comments for CVE-2026-61684

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