~/exploited / cve-2026-110447
CVE-2026-110447: Collabora Online – Built-in CODE Server
According to CISA this vulnerability is already used in attacks (added on 23 October 2026).
Key facts
| CVE | CVE-2026-110447 |
|---|---|
| Vendor | Collabora — Collabora Online – Built-in CODE Server |
| Vulnerability | Collabora Online – Built-in CODE Server OS Command Injection Vulnerability |
| Added | 23 October 2026 |
| Deadline (US agencies) | 26 October 2026 |
| Ransomware campaigns | unknown |
Description (CISA)
Collabora Collabora Online – Built-in CODE Server when used within the NextCloud platform contains an OS command injection vulnerability that allows for remote code execution when the CODE server isn't running.
Required action (CISA)
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.
What admins should do now
- Affected? Check whether Collabora Online – Built-in CODE Server is in use and which version runs (package manager, admin UI,
--version). - Apply the vendor patch or workaround as soon as it exists. If that is not possible right away: restrict outside access (firewall, VPN, reverse proxy).
- Review logs back to 23 October 2026: unusual logins, new files, unexpected processes, outbound connections.
- If you suspect a compromise: isolate the system, rotate credentials, check the last backup from before the incident.
The deadline applies to US federal agencies. It is still a useful yardstick for everyone: when a flaw is attacked in the wild, waiting is not an option.
Sources
- CISA KEV Catalog
- NVD CVE-2026-110447
- help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516
- github.com/CollaboraOnline/online/security/advisories/GHSA-g3vx-3m76-fghh
- www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-base
- www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizi
- nvd.nist.gov/vuln/detail/CVE-2026-110447
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