CVE-2026-61684

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.

• CWE-798

• https://github.com/labring/FastGPT/commit/f5f1e58b25571b7107ca49d9bf96bb2b0e0a620a
• https://github.com/labring/FastGPT/pull/7170
• https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5
• https://github.com/labring/FastGPT/security/advisories/GHSA-w732-rq8c-chc8
• https://github.com/labring/FastGPT/security/advisories/GHSA-w732-rq8c-chc8

Published

Jul 15, 2026

Last Modified

Jul 15, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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