CRITICAL · CVSS 9.2
ACTIVELY EXPLOITED
PATCH AVAILABLE
CVE-2026-110447: Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
| Vendor | Collabora |
|---|---|
| Product | Collabora Online – Built-in CODE Server |
| CVSS score | 9.2 · CVSS 4.0 · CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| EPSS | 73.3% (percentile 99) |
| Actively exploited | Yes |
| Added to CISA KEV | 23 Oct 2026 |
| CISA federal deadline | 26 Oct 2026 |
| Weakness (CWE) | CWE-78 |
| NVD published | 14 Oct 2026 |
| NVD last modified | 30 Oct 2026 |
| NVD status | Analyzed |
Affected versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Collabora Collabora Online - Built-In Code Server | before 26.4.303 | 26.4.303 |
Required action (CISA's text)
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.
Description (NVD)
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.
SOURCES
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 30 Oct 2026.