Catalog analysis: CISA added this entry on October 23, 2026. The entry reflects catalog information retrieved on October 24, 2026, not a snapshot archived on the inclusion date. This site’s publication date is shown separately. Check current vendor guidance before acting.
What the vulnerability is
CVE-2026-110447 is an OS command injection vulnerability (CWE-78) located in the Collabora Online – Built-in CODE Server. The flaw allows for remote code execution (RCE) specifically under conditions where the CODE server is not running while integrated within the NextCloud platform.
Exposure and applicability
This vulnerability applies to organizations utilizing the built-in CODE server version of Collabora Online as part of a NextCloud deployment. Assets are exposed if they are running the affected software and have not applied the vendor’s mitigations. Because this flaw allows for remote code execution, assets with direct internet exposure should be prioritized for remediation.
Remediation priorities
Based on the reported vulnerability, our analysis suggests the following prioritization for vulnerability management teams:
- Asset Identification: Identify all NextCloud instances utilizing the built-in Collabora Online CODE server.
- Immediate Mitigation: Apply mitigations according to the official vendor instructions provided by Collabora and NextCloud.
- Forensic Triage: Because this vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog and requires forensic triage, defenders should examine logs for signs of unauthorized command execution prior to patching.
- Exposure Reduction: Evaluate whether the affected service must be internet-facing or if it can be restricted to internal networks to reduce the attack surface while updates are being verified.
How to validate remediation
To ensure that exposure has been reduced, defenders should move beyond simple version checks. We recommend the following validation approach:
- Configuration Audit: Verify that the mitigations specified in the vendor instructions have been applied across all identified instances.
- State Verification: Confirm the operational status of the CODE server to determine if the specific condition required for this RCE (the server not running) is still present or has been mitigated by the update.
- Log Analysis: Review system and application logs for anomalous shell activity or unexpected process spawns that would indicate a successful command injection attempt.
Limits and open questions
It remains unknown whether specific ransomware campaigns are currently utilizing this vulnerability. Furthermore, while vendor mitigations are available, the effectiveness of these controls depends on correct implementation across diverse NextCloud environment configurations. There is residual risk if forensic triage is skipped, as a system could be patched while an attacker maintains persistence established via the vulnerability before the fix was applied.
Source and editorial note
CVE-2026-110447: Collabora Online – Built-in CODE Server OS Command Injection Vulnerability · Source date: October 23, 2026 · Retrieved October 24, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
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