CVE WatchJul 9, 2026

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

CVSS

8.6

High

EPSS

0.3%

p22

KEV

—

Exploit Today

0-100

Published: Jul 7, 2026 · Last modified: Jul 9, 2026 · CWE-639

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-07-082026-07-21

Technical description

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 the key belongs to the caller's team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team's key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.

Official references

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