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CVE-2026-110447

9.8 · CRITICALActively Exploited

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 vulnera…

Published Oct 14, 2026collaboraCWE-78EPSS 73.31%

Overview

CVE-2026-110447 is a critical-severity vulnerability affecting collabora collabora_online_-_built-in_code_server. It was published on October 14, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from collabora. Update collabora_online_-_built-in_code_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
collaboracollabora_online_-_built-in_code_server>= 0, < 26.4.303Affected

References

GitHubgithub.com/CollaboraOnline/richdocumentscode/issues/354Refhelp.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516CISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-110447

How CyberStrike helps

Frequently asked questions

What is CVE-2026-110447?

CVE-2026-110447 is a critical-severity vulnerability affecting collabora collabora_online_-_built-in_code_server. It was published on October 14, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-110447?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-110447?

Check the references section for vendor advisories and patches from collabora. Update collabora_online_-_built-in_code_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-110447?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-110447 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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