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CVE-2026-4957— OpenBMB XAgent API Key function_handler.py FunctionHandler.handle_tool_call log file

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版本存在日志信息泄露漏洞，该漏洞源于对文件XAgent/function_handler.py中参数api_key的错误操作，可能导致日志文件中的敏感信息泄露。

CVSS 2.7 · Low EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-4957

Vulnerability Information
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Vulnerability Title
OpenBMB XAgent API Key function_handler.py FunctionHandler.handle_tool_call log file
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in OpenBMB XAgent 1.0.0. The impacted element is the function FunctionHandler.handle_tool_call of the file XAgent/function_handler.py of the component API Key Handler. This manipulation of the argument api_key causes sensitive information in log files. The attack may be initiated remotely. The exploit has been published 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:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
XAgent 日志信息泄露漏洞
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版本存在日志信息泄露漏洞，该漏洞源于对文件XAgent/function_handler.py中参数api_key的错误操作，可能导致日志文件中的敏感信息泄露。
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-2026-4957

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III. Intelligence Information for CVE-2026-4957

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Vendor Advisories for CVE-2026-4957 (2)

Proof of Concept for CVE-2026-4957 (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-2026-4958 3.1 LOW OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization

IV. Related Vulnerabilities

Same product: XAgent
Same vendor: OpenBMB
Same weakness: CWE-532

V. Comments for CVE-2026-4957

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