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CVE-2026-68929 – Authentication Bypass / WeChat Bot Hijack & DoS – FastGPT 4.14.10–4.14.28 and 4.15.

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Summary

CVE-2026-68929 is a missing-authorization vulnerability in FastGPT’s WeChat (iLink) outLink integration. The affected endpoints rely solely on the public shareId value to authorize sensitive actions, with no check that the caller actually owns the team or bot involved. This allows unauthenticated network attackers to hijack a victim’s WeChat bot binding or force it offline, and the flaw carries a CVSS score of 9.3 (Critical).

Technical details

  • Root cause: the outLink authorization helper used by the WeChat channel endpoints validates only that a shareId exists, without verifying the caller’s login session or team ownership.
  • Trigger condition: an attacker who obtains or guesses a valid shareId (a public identifier used for sharing bots) can call the logout and QR-code status endpoints directly.
  • Attack vector: fully network-based, no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: the logout endpoint can be abused to wipe a victim bot’s tokens (denial of service); the QR-code status endpoint accepts attacker-supplied credentials and writes them into the victim’s outLink configuration, effectively rebinding the victim’s app to an attacker-controlled WeChat bot and exposing private conversation responses.

Affected software

  • FastGPT versions 4.14.10 through 4.14.28
  • FastGPT versions 4.15.0 through 4.15.1

Severity

  • CVSS v4.0 Base Score: 9.3 (Critical)
  • Vector: 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

Mitigation and recommended actions

  • Immediate: upgrade FastGPT to version 4.15.2, which replaces the flawed authorization check with team-scoped authentication validation on the affected endpoints.
  • If patching is not immediately possible: restrict or disable public network access to the WeChat/iLink outLink logout and QR-code status endpoints, rotate any shareId values used for WeChat bot bindings, and monitor for unexpected outLink/bot rebinding events.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: FastGPT
  • Script source URL: path under /_next/static/ containing fastgpt with a .js or .css extension
  • Raw response body: path under /assets/ containing fastgpt with a .js or .css extension

References

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