Collabora Collabora Online – Built-in CODE Server
CVE-2026-110447
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.
What this means for your business
- It affects Collabora Online – Built-in CODE Server. It matters if your company, or a supplier that handles your data, runs it.
- Attackers are already using it. CISA added it to its list of flaws used in real attacks on 23 October 2026.
- FIRST's prediction model gives it a 12% chance of attack attempts being seen in the next 30 days, ranking above 96% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Collabora Online – Built-in CODE Server.
- 2If you do, follow CISA's required action below. No patch reference has been published yet.
- 3Treat it as urgent. US federal agencies must fix it by 26 October 2026. That deadline does not apply to private companies, but it shows how seriously CISA takes it.
- 4Because attackers have used it, check the affected systems for signs of a break-in, not only for the update.
Fastnexa security experts
Attackers are already using this flaw. Is your Collabora Collabora Online – Built-in CODE Server exposed?
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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.
CISA’s wording, unedited. The notes it mentions are in CISA’s catalogue entry.
Scoring
- CVSS
- Not yet scored
- CVSS v4
- 9.2
- Weakness
- CWE-78
- Assigned by
- cve@mitre.org
Dates
- Published
- 2026-10-23
- Last modified
- 2026-10-14
- Added to KEV
- 2026-10-23
- Remediation due
- 2026-10-26
- Sources
- CISA KEV, NVD
Coverage
- CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloudThe Hacker News · 2026-10-24