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