JoySafeter through 1.0.0 Authenticated RCE via Copilot Standard Mode Shell

Advisories

JoySafeter through 1.0.0 Authenticated RCE via Copilot Standard Mode Shell

Severity: high
Date: 10/19/2026
Affecting: JoySafeter <= 1.0.0
CVE: CVE-2026-109443
CWE: CWE-653 Improper Isolation or Compartmentalization
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: Lasso.security Advisory
https://github.com/jd-opensource/JoySafeter/blob/12234a11a9d96acef85577afb1fa5682169d6171/backend/app/core/agent/backends/utils/command_executor.py#L110
https://github.com/jd-opensource/JoySafeter/blob/12234a11a9d96acef85577afb1fa5682169d6171/backend/app/services/copilot_service.py#L106
Credit: Noy Pearl, Michael Sromin, Ophir Dror
Description: JoySafeter through 1.0.0 contains a remote code execution vulnerability that allows authenticated users to run operating system commands via an unsandboxed execute tool in Copilot standard mode. Attackers can self-register, select standard mode in the WebSocket chat.start extension, and have the agent invoke subprocess.run with shell=True on the host to access other tenants' data and server secrets.

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