CVE-2026-110447
Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
Collabora·Online – Built-in CODE Server
- Added
- Oct 23, 2026
- Fix due
- Oct 26, 2026
- Ransomware
- Not known
- Published
- Oct 14, 2026
- Updated
- Oct 24, 2026
- First covered
- Oct 17, 2026
- Latest story
- 4 weeks ago
Summary
Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208. This is an OS command injection in proxy.php when the CODE server isn't running (e.g., the product was recently restarted). The vulnerability is not present in standalone Collabora Online servers; only this deployment with CODE Server is affected.
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Attack profile
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCISA required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected products
- Collabora Online - Built-in CODE Serverbefore 26.4.303