Labring FastGPT up to 4.15.1 WeChat Integration improper authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in Labring FastGPT up to 4.15.1. Affected is an unknown function of the component WeChat Integration. This manipulation causes improper authorization. The identification of this vulnerability is CVE-2026-68929. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Labring FastGPT up to 4.15.1. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component WeChat Integration. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-68929 since 07/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 4.15.2 eliminates this vulnerability.

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Productinfo

Vendor

• Labring

Name

• FastGPT

Version

• 4.15.0
• 4.15.1

Website

• Product: https://github.com/labring/FastGPT/

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