PT-2026-56264 · Labring · Fastgpt

Geo-Chen · Published 2026-07-07 · Updated 2026-07-07 · CVE-2026-55418

Mitre

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

Fix

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

CVE-2026-55418

Affected Products

Fastgpt

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-55418 · Security Note
• https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c · Note
• https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5 · Note
• https://github.com/labring/FastGPT/pull/7104 · Note
• https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5 · Note