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CVE-2026-4959— OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication

Quick assessment

Affected
OpenBMB XAgent
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.

XAgent是OpenBMB开源的一个开源的实验性大型语言模型（LLM）驱动的自治代理。 XAgent 1.0.0版本存在访问控制错误漏洞，该漏洞源于对文件XAgentServer/application/websockets/share.py中参数interaction_id的错误操作，可能导致缺少身份验证。

CVSS 7.3 · High EPSS 0.76% · P54
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I. Basic Information for CVE-2026-4959

Vulnerability Information
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Vulnerability Title
OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in OpenBMB XAgent 1.0.0. This impacts the function check_user of the file XAgentServer/application/websockets/share.py of the component ShareServer WebSocket Endpoint. Performing a manipulation of the argument interaction_id results in missing authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
XAgent 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XAgent是OpenBMB开源的一个开源的实验性大型语言模型（LLM）驱动的自治代理。 XAgent 1.0.0版本存在访问控制错误漏洞，该漏洞源于对文件XAgentServer/application/websockets/share.py中参数interaction_id的错误操作，可能导致缺少身份验证。
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
OpenBMB XAgent 1.0.0 cpe:2.3:a:openbmb:xagent:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4959

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III. Intelligence Information for CVE-2026-4959

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Proof of Concept for CVE-2026-4959 (1)

Same Patch Batch · OpenBMB · 2026-03-27 · 3 CVEs total

CVE-2026-4958 3.1 LOW OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization
CVE-2026-4957 2.7 LOW OpenBMB XAgent API Key function_handler.py FunctionHandler.handle_tool_call log file

IV. Related Vulnerabilities

Same product: XAgent
Same vendor: OpenBMB
Same weakness: CWE-306

V. Comments for CVE-2026-4959

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