SB20261015164 - Remote code execution in Collabora Online Built-in CODE Server app

Description

This security bulletin contains information about 1 vulnerability.

1) OS Command Injection (CVE-ID: CVE-2026-110447) Exploited

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: 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]

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. 

Remediation

Install update from vendor's website.

References

• https://github.com/CollaboraOnline/online/security/advisories/GHSA-g3vx-3m76-fghh
• https://github.com/CollaboraOnline/richdocumentscode/issues/354#issuecomment-6164261298
• https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516
• https://github.com/advisories/GHSA-F97P-R72Q-64H2