# CVE-2026-110447: Collabora Online Built-in CODE Server - RCE

> Live exploitation tracking for CVE-2026-110447 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-110447

## Key facts

- **Exploitation phase:** Insufficient Data. Not enough CrowdSec telemetry data is available to confidently assess how this vulnerability is exploited in the wild.
- **CVSS score:** 9.2
- **Public exploit available:** Yes
- **Affected products:** Collabora Online - Built-in CODE Server
- **Weaknesses:** CWE-78 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'))
- **Tags:** web_application

## 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.

## CrowdSec analysis

[CVE-2026-110447](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-110447) is a critical OS command injection vulnerability in the Collabora Online Built-in CODE Server Nextcloud app (richdocumentscode) before version 26.4.303. When the CODE server is not running, unauthenticated remote attackers can exploit `proxy.php` to execute commands on the host, potentially compromising its confidentiality, integrity, and availability; standalone Collabora Online servers are not affected. This vulnerability has reportedly been exploited in the wild.

CrowdSec has been tracking this vulnerability and its exploits since 29th of October 2026.

CrowdSec has not observed any significant exploitation activity targeting CVE-2026-110447 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers target `/apps/richdocumentscode/proxy.php` or `/apps/richdocumentscode_arm64/proxy.php`, using a traversal-style URL and shell command substitution in the request path to attempt OS command execution. The exploit request commonly includes a `status` query parameter and a command that makes an outbound callback.

## Timeline

- 2026-10-14: CVE Published. CVE-2026-110447 is published to NVD.
- 2026-10-23: CISA KEV. CVE-2026-110447 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2026-10-26: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2026-10-29: Rule Released. CrowdSec releases a rule to detect CVE-2026-110447 exploitation attempts against the CrowdSec Network.
- 2026-11-04: First exploitation attempt seen by CrowdSec

## References

- https://github.com/CollaboraOnline/richdocumentscode/issues/354
- https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-110447.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-110447) follows observed exploitation activity for CVE-2026-110447. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.