Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-61684FastGPT: Unauthenticated cross-tenant data access via forgeable plugin-invoke JWT (default INVOKE_TOKEN_SECRET='token')

High 8.8

In plain English

A high-severity hard-coded credentials in FastGPT from labring. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 4.0)8.8High

Exploit odds (30 days)0.4%top 67.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
labring	FastGPT	= 4.15.0-beta4

Weakness: CWE-798 · Vector: 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

References

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