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CVE-2026-110447: Collabora Online – Built-in CODE Server OS Command Injection Vulnerability

Critical · CVSS 9.2 (CVSS 4.0)KEV known exploitedEPSS 12.3%, 96th percentilePublished Updated Assigner: mitre

In CISA’s Known Exploited Vulnerabilities catalog: Collabora Online – Built-in CODE Server OS Command Injection Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

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.

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.

CWE-78

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Collabora: Collabora Online - Built-in CODE Server

References

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