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CVE-2026-68929— FastGPT: Unauthenticated WeChat channel hijack and denial of service via shareId-only authorization

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 4.14.10版本至4.14.29之前版本和4.15.0版本至4.15.2之前版本存在授权问题漏洞，该漏洞源于WeChat (iLink)分享渠道端点仅使用公开的shareId进行授权，缺少身份验证和团队所有权检查，可能导致未经身份验证的攻击者劫持受害团队的微信机器人，暴露应用私有响应并消耗资源。

CVSS 9.3 · Critical EPSS 0.43% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
labring FastGPT >= 4.14.10, < 4.14.29 affected
>= 4.15.0, < 4.15.2 affected
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I. Basic Information for CVE-2026-68929

Vulnerability Information
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Vulnerability Title
FastGPT: Unauthenticated WeChat channel hijack and denial of service via shareId-only authorization
Source: CVE Program / CVE List V5
Vulnerability Description
FastGPT is an open-source LLM platform for building AI applications on a knowledge base. In versions prior to 4.15.2, the WeChat (iLink) share-channel endpoints authorize requests using only the public shareId, with no authenticated identity or team-ownership check. As a result, an unauthenticated attacker who knows a victim team's shareId can take that team's WeChat bot offline or hijack the channel to their own bot: the logout endpoint is gated only by an existence check yet wipes the outLink's stored WeChat token, and the QR-code status endpoint performs no authorization at all and writes attacker-supplied bot credentials into the outLink identified by shareId. By generating a QR for a victim shareId, scanning it with their own WeChat, and calling the status endpoint, an attacker binds the victim team's app to the attacker's bot, exposing the app's private responses, displacing the legitimate binding, and consuming the victim's resources. The shareId is exposed in every shared chat URL, iframe, and embed, so it is not a secret. This issue is fixed in version 4.15.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
labring FastGPT 授权问题漏洞
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 4.14.10版本至4.14.29之前版本和4.15.0版本至4.15.2之前版本存在授权问题漏洞，该漏洞源于WeChat (iLink)分享渠道端点仅使用公开的shareId进行授权，缺少身份验证和团队所有权检查，可能导致未经身份验证的攻击者劫持受害团队的微信机器人，暴露应用私有响应并消耗资源。
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 >= 4.14.10, < 4.14.29 -

II. Public POCs for CVE-2026-68929

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III. Intelligence Information for CVE-2026-68929

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Vendor Advisories for CVE-2026-68929 (1)

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-862

V. Comments for CVE-2026-68929

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