CVE-2026-110447 Exploited in the wild
Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
- Risk score
- 100/100
- CVSS
- 9.2 v4.0
- Exploit chance (30 days)
- 2.3%
- Published
- 14 Oct 2026
- Added to CISA's exploited list
- 23 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Collabora Online Built-in CODE Server has a vulnerability allowing OS command injection when the CODE server isn't running, which can lead to remote code execution. An attacker could exploit this to execute arbitrary OS commands.
- Affected
- {'products': ['Collabora Online – Built-in CODE Server'], 'packages': [], 'versions': ['before 26.4.303 (richdocumentscode)']}
- Fix
- Apply mitigations in accordance with vendor instructions
- Exploitation
- Exploited in the wild
In the news
TL;DR
Collabora Online Built-in CODE Server has a critical OS command injection vulnerability (CVE-2026-110447) that allows remote code execution, exploited in the wild in September and October 2026.
- The vulnerability is in proxy.php when the CODE server isn't running.
- Collabora Online Built-in CODE Server is a Nextcloud app.
- CISA has named this vulnerability in their KEV database.
- The vulnerability is remotely exploitable without logging in.
AI summary of 1 article.
Why it is Red
- CVSS 9.2 critical
- Exploited in the wild (CISA KEV)
- Remotely exploitable without logging in
- Named in a government or vendor bulletin
CISA 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.
Government and vendor bulletins
References
Original description
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.
Last activity 23 Oct 2026. Patch Forecast updates every hour.