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CVE-2026-42276— Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions

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POST /chat/stop-chat-session/{chat_session_id}端点检查身份验证但未验证会话属于调用者，可能导致攻击者停止其他用户的活跃聊天会话。

CVSS 4.3 · Medium EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1098.004 · SSH Authorized Keys

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-2026-42276

Vulnerability Information
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Vulnerability Title
Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions
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 POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. 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:N/I:N/A:L
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POST /chat/stop-chat-session/{chat_session_id}端点检查身份验证但未验证会话属于调用者，可能导致攻击者停止其他用户的活跃聊天会话。
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-2026-42276

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III. Intelligence Information for CVE-2026-42276

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Vendor Advisories for CVE-2026-42276 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42276

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