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CVE-2026-4958— OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization

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版本存在安全漏洞，该漏洞源于对文件XAgentServer/application/websockets/replayer.py中参数interaction_id的错误操作，可能导致授权绕过。

CVSS 3.1 · Low EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-4958

Vulnerability Information
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Vulnerability Title
OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in OpenBMB XAgent 1.0.0. This affects the function ReplayServer.on_connect/ReplayServer.send_data of the file XAgentServer/application/websockets/replayer.py of the component WebSocket Endpoint. Such manipulation of the argument interaction_id leads to authorization bypass. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is reported as difficult. The exploit has been disclosed to the public and may 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:H/PR:L/UI:N/S:U/C:L/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
XAgent 安全漏洞
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版本存在安全漏洞，该漏洞源于对文件XAgentServer/application/websockets/replayer.py中参数interaction_id的错误操作，可能导致授权绕过。
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-2026-4958

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III. Intelligence Information for CVE-2026-4958

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Proof of Concept for CVE-2026-4958 (1)

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

CVE-2026-4959 7.3 HIGH OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication
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-639

V. Comments for CVE-2026-4958

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