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Vulnerability record · CVE-2026-61684 · published 15 July 2026

CVE-2026-61684: Hard-coded credentials vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.51% · top 58.7% CWE-798 · Hard-coded credentials Deferred
8.8CVSS 4.0 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
15 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-61684), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.