Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck

CVE-2026-109443JoySafeter through 1.0.0 Authenticated RCE via Copilot Standard Mode Shell

High 8.8

In plain English

A high-severity security flaw in JoySafeter from jd-opensource. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 41.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
jd-opensource	JoySafeter	0 – through 1.0.0

Weakness: CWE-653 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Lasso.security Advisory technical-description, exploit
https://github.com/jd-opensource/JoySafeter/blob/12234a11a9d96acef85577afb1fa5682169d6171/backend/app/core/agent/backends/utils/command_executor.py#L110 technical-description
https://github.com/jd-opensource/JoySafeter/blob/12234a11a9d96acef85577afb1fa5682169d6171/backend/app/services/copilot_service.py#L106 technical-description
VulnCheck Advisory: JoySafeter through 1.0.0 Authenticated RCE via Copilot Standard Mode Shell third-party-advisory