CVE-2026-110447: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in Collabora Collabora Online - Built-in CODE Server
Description
CVE-2026-110447 is a critical OS command injection vulnerability in Collabora Online's Built-in CODE Server versions before 26.4.303. It allows remote code execution via proxy.php when the CODE server is not running, such as after a restart. This vulnerability affects only the integrated CODE Server deployment, not standalone Collabora Online servers. It was exploited in the wild in September and October 2026.
CVSS v4.0
Score 9.2critical
Affected software
Collabora
Collabora Online - Built-in CODE Server
pkg:github/richdocumentscodeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Collabora Online Built-in CODE Server prior to version 26.4.303 contains an OS command injection vulnerability (CWE-78) in the proxy.php component. This flaw occurs when the CODE server is not running, enabling remote attackers to execute arbitrary OS commands. This vulnerability is distinct from CVE-2025-66208 and affects only the integrated CODE Server deployment within Nextcloud apps, not standalone servers. The vulnerability has a CVSS 4.0 score of 9.2, indicating critical severity.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary operating system commands on the affected server, potentially leading to full system compromise. The vulnerability is exploitable when the CODE server is not running, such as after a restart, increasing the risk during such periods. This can lead to significant impact including data breach, service disruption, and unauthorized control of the server.
Mitigation Recommendations
A fix is available in Collabora Online Built-in CODE Server version 26.4.303. Users should upgrade to version 26.4.303 or later to remediate this vulnerability. Since this is not a cloud service, manual patching is required. No vendor advisory content was provided, so verify the vendor's official advisory for confirmation and additional mitigation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-14T02:27:41.637Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aceeda52cdf04f6562ea69c
Added to database: 10/14/2026, 02:49:09 UTC
Last enriched: 10/14/2026, 03:03:26 UTC
Last updated: 10/14/2026, 03:04:00 UTC
Views: 8
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