OS Command Injection in Built-in CODE Server app - CVE-2026-110447
Published: October 15, 2026
Vulnerability identifier: #VU155948
CSH Severity: Critical
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-110447
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary operating system commands as the web server user.
The vulnerability exists due to operating system command injection in the richdocumentscode proxy.php component when handling requests. A remote attacker can send a specially crafted request to execute arbitrary operating system commands as the web server user.
Exploitation is possible only while the built-in CODE server is not running, such as after a container restart, an upgrade, or a crash.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Built-in CODE Server app
How to mitigate CVE-2026-110447
Install security update from vendor's website.
Built-in CODE Server app - update to 26.4.303