Critical severity · published Dec 3, 2025
CVE-2025-66208
Collabora Online - Built-in CODE Server (richdocumentscode) provides a built-in server with all of the document editing features of Collabora Online
9.8
CVSS
1.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ON
Online · Collabora
before 25.04.702 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66208
Patch
https://github.com/CollaboraOnline/online/security/advisories/GHSA-j3q6-q5pc-v5wf
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