CVE-2026-61684Public exploitNetwork attack vector

Unauthenticated data access via forgeable invoke JWT

Published Jul 15, 2026 · Updated Jul 15, 2026

Authentication bypass in Labring FastGPT 4.15.0-beta4 allows remote attackers to read cross-tenant PII and write chat files. Plugin invoke endpoints accept HS256 JWTs signed with INVOKE_TOKEN_SECRET, which defaults to the public constant token in official deployments. Exploitation requires a victim tmbId and any valid teamId; access then exposes user contact and organization data or plants content in chat files.

CVSS severity8.8
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Labring FastGPT 4.15.0-beta4 allows remote attackers to read cross-tenant PII and write chat files. Plugin invoke endpoints accept HS256 JWTs signed with INVOKE_TOKEN_SECRET, which defaults to the public constant token in official deployments. Exploitation requires a victim tmbId and any valid teamId; access then exposes user contact and organization data or plants content in chat files.

The record

CVE
CVE-2026-61684
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Labring
Product
FastGPT
Classifications
CWE-798, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion== 4.15.0-beta4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Labring · FastGPTversion== 4.15.0-beta4

Published CVSS scores

8.8GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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