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CVE-2026-55418

HIGH
8.6
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55418
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 21:48 UTC
Published
2026-07-07 21:18 UTC
Last updated
2026-07-07 21:18 UTC
Primary CWE
CWE-639
CWE-639: Authorization Bypass Through User-Controlled Key
Vendor / Product
labring / FastGPT
Sources
cve.org  ·  NVD

Severity & Metrics

8.6 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products (1)
VendorProductPlatformVersions
labring FastGPT — < 4.15.0-beta5
Weakness (CWE)
CWESourceDescription
CWE-639 cna CWE-639: Authorization Bypass Through User-Controlled Key
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.6 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References (4)
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