CVE-2025-66208

CriticalCVSS 9.8/10Last modified Oct 30, 2026

Description

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-78

Affected software

Vendor	Product	Versions
CollaboraOnline	online	< 25.04.702

References

https://github.com/CollaboraOnline/online/security/advisories/GHSA-j3q6-q5pc-v5wfPatch, Vendor Advisory

Timeline

Published: Dec 3, 2025
Last modified: Oct 30, 2026
NVD status: Analyzed

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