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CVE-2026-55418— FastGPT: S3 presign/read handlers do not bind the object key to the caller's team (cross-team file disclosure)

Quick assessment

Affected
labring FastGPT
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

labring FastGPT是labring公司开源的一款基于大语言模型的开源知识库问答系统。 labring FastGPT 4.15.0-beta5之前版本存在授权问题漏洞，该漏洞源于文件处理程序授权无关资源，并使用直接从请求中获取的密钥签名或读取S3对象，而未检查该密钥是否属于调用者的团队，导致攻击者可通过chat-file presign端点或dataset preview端点提供其他团队的密钥并获取其文件内容。

CVSS 8.6 · High EPSS 0.48% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
labring FastGPT < 4.15.0-beta5 affected
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I. Basic Information for CVE-2026-55418

Vulnerability Information
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Vulnerability Title
FastGPT: S3 presign/read handlers do not bind the object key to the caller's team (cross-team file disclosure)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
labring FastGPT 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
labring FastGPT是labring公司开源的一款基于大语言模型的开源知识库问答系统。 labring FastGPT 4.15.0-beta5之前版本存在授权问题漏洞，该漏洞源于文件处理程序授权无关资源，并使用直接从请求中获取的密钥签名或读取S3对象，而未检查该密钥是否属于调用者的团队，导致攻击者可通过chat-file presign端点或dataset preview端点提供其他团队的密钥并获取其文件内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
labring FastGPT < 4.15.0-beta5 -

II. Public POCs for CVE-2026-55418

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12710 chars
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III. Intelligence Information for CVE-2026-55418

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Patches & Fixes for CVE-2026-55418 (1)

Vendor Advisories for CVE-2026-55418 (1)

Vendor Pages for CVE-2026-55418 (1)

Same Patch Batch · labring · 2026-07-07 · 4 CVEs total

CVE-2026-54607 7.7 HIGH FastGPT: SSRF in HTTP-tool OpenAPI schema importer via SwaggerParser $ref (bypasses the is
CVE-2026-54601 6.3 MEDIUM FastGPT: reTrainingCollection allows server-owned datasetId override causing cross-tenant
CVE-2026-54602 FastGPT: Cross-team LLM request/response disclosure (IDOR) via /api/core/ai/record/getReco

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-639

V. Comments for CVE-2026-55418

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