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CVE-2026-42277— Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files

Quick assessment

Affected
onyx-dot-app onyx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Onyx是Onyx开源的一个AI大模型平台。 Onyx 3.0.9之前版本、3.1.6之前版本和3.2.6之前版本存在安全漏洞，该漏洞源于GET /chat/file/{file_id}端点验证调用者身份但未检查文件所有权，可能导致攻击者下载其他用户的上传文件。

CVSS 6.5 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
onyx-dot-app onyx < 3.0.9 affected
>= 3.1.0, < 3.1.6 affected
>= 3.2.0, < 3.2.6 affected
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I. Basic Information for CVE-2026-42277

Vulnerability Information
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Vulnerability Title
Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files
Source: CVE Program / CVE List V5
Vulnerability Description
Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any user in the system. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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
Onyx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Onyx是Onyx开源的一个AI大模型平台。 Onyx 3.0.9之前版本、3.1.6之前版本和3.2.6之前版本存在安全漏洞，该漏洞源于GET /chat/file/{file_id}端点验证调用者身份但未检查文件所有权，可能导致攻击者下载其他用户的上传文件。
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
onyx-dot-app onyx < 3.0.9 -

II. Public POCs for CVE-2026-42277

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III. Intelligence Information for CVE-2026-42277

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Vendor Advisories for CVE-2026-42277 (1)

IV. Related Vulnerabilities

Same product: onyx
Same vendor: onyx-dot-app
Same weakness: CWE-639

V. Comments for CVE-2026-42277

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