What’s Vulnerable › Vulnerabilities

CVE-2026-54601: FastGPT: reTrainingCollection allows server-owned datasetId override causing cross-tenant authorization confusion

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-07 · updated 2026-10-25
• Weakness: CWE-915

Description

FastGPT is an open source AI knowledge base platform. From 4.14.17 to before 4.15.0-beta4, FastGPT allows an authenticated tenant user to call POST /api/core/dataset/collection/create/reTrainingCollection in a way that persists a server-owned datasetId value from another tenant. This creates mixed dataset objects and downstream dataset, collection, and training endpoints then make authorization decisions from inconsistent ownership anchors, allowing cross-tenant read, update, and delete access when mixed object ids are known. This issue is fixed in version 4.15.0-beta4.

Affected products

• labring FastGPT: from 4.14.17, < 4.15.0-beta4

References

• https://github.com/labring/FastGPT/commit/54a53e7d4399f1dfa2913394442c3cf6de672fb3
• https://github.com/labring/FastGPT/pull/7071
• https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta4
• https://github.com/labring/FastGPT/security/advisories/GHSA-qxcq-48gr-93pj
• https://github.com/labring/FastGPT/security/advisories/GHSA-qxcq-48gr-93pj

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