# CVE-2025-66208: Collabora Online - Built-in CODE Server (richdocumentscode) provides a built-in server with all of the document…

Source: https://junglewise.ai/threats/cve-2025-66208-collabora-online-built-in-code-server-richdocumentscode-provides  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-03  
License: CC BY 4.0 with a link back

CVE-2025-66208 · Severity: critical · CVSS 9.8 · Published 2025-12-03

Collabora Online - Built-in CODE Server (richdocumentscode) provides a built-in server with all of the document editing features of Collabora Online. In versions prior to 25.04.702, Collabora Online has a Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy. Users of Nextcloud with Collabora Online - Built-in CODE Server app can be vulnerable to attack via proxy.php and an intermediate reverse proxy. This vulnerability is fixed in 25.04.702.

Technologies: [Collabora Online](https://junglewise.ai/threats/technologies/online). Vendors: [Collabora](https://junglewise.ai/threats/vendors/collabora).

## Quick answers

**Is CVE-2025-66208 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-66208 being exploited in the wild.

**How severe is CVE-2025-66208?** Critical severity, with a CVSS score of 9.8, published 3 December 2025.

**Which products and versions are affected?** Collabora Online. The advisory does not name versions.

**Is there a fix for CVE-2025-66208?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-66208?** Check whether you run Collabora Online. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Collabora Online

## Related threats

- [Collabora Online reflected HTML injection in cool.html](https://junglewise.ai/threats/cve-2026-48164-collabora-online-is-a-collaborative-online-office-suite-based-on)
- [Collabora Online read-only session enforcement bypass](https://junglewise.ai/threats/cve-2026-46499-collabora-online-is-a-collaborative-online-office-suite-based-on)