CVE-2026-110447 Details
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.
A remote code execution vulnerability has been identified in Collabora Online Built-in CODE Server versions prior to 26.4.303, specifically within the richdocumentscode Nextcloud app. This vulnerability arises from an OS command injection in the proxy.php file, occurring when the CODE server is not actively running, such as immediately after a restart. The issue is exclusive to this deployment mode and does not affect standalone Collabora Online servers.
Users are advised to update to Collabora Online Built-in CODE Server version 26.4.303 or later. After upgrading, it is important to remove any residual 'shx*.php' web shell files that may have been created during the exploitation of this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Oct 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-110447 | CISA-ADP | US Government Resource |
| https://github.com/CollaboraOnline/richdocumentscode/issues/354 | [email protected] | Issue Tracking |
| https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516 | [email protected] | Vendor Advisory |
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name | Date Added | Due Date | Required Action |
|---|---|---|---|
| Collabora Online – Built-in CODE Server OS Command Injection Vulnerability | Oct 23, 2026 | Oct 26, 2026 | 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. |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-78 | Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| collabora collabora online - built-in code server | < 26.4.303 |
CPE
Remediation
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Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 30, 2026 | Reanalysis | [email protected] |
| Oct 26, 2026 | Initial Analysis | [email protected] |
| Oct 24, 2026 | CVE Modified | CISA-ADP |
| Oct 23, 2026 | CVE CISA KEV Update | Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government |
| Oct 23, 2026 | CVE Modified | CISA-ADP |
| Oct 23, 2026 | CVE Modified | CISA-ADP |
| Oct 23, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | New CVE Received | [email protected] |