CVE-2026-55418

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

07/07/2026

Last modified:

09/07/2026

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&#39;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&#39;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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 8.60 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x

8.60

Severity 3.x

HIGH

CVE-2026-55418

Description

Impact

References to Advisories, Solutions, and Tools