Auth bypass in Labring Fastgpt

CVE-2026-55418

FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that t…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-55418?
CVE-2026-55418 is a high-severity vulnerability in Labring Fastgpt, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.6/10. Published 2026-07-07.
How severe is CVE-2026-55418?
High severity. CVSS v3 base score is 8.6 out of 10.