CVE-2026-55418
HIGHFastGPT: S3 presign/read handlers do not bind the object key to the caller's team (cross-team file disclosure)
Title source: cnaDescription
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.
References (4)
Core 4
Core References
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https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5
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https://github.com/labring/FastGPT/pull/7104
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https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c
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https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5
Scores
CVSS v3
8.6
EPSS
0.0030
EPSS Percentile
21.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Details
CWE
CWE-639
Status
published
Products (1)
labring/FastGPT
< 4.15.0-beta5
Published
Jul 07, 2026
Tracked Since
Jul 08, 2026