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CVE-2025-66208

Collabora Online command injection

9.8 CRITICALEPSS 1.08%
  1. Published3 Dec 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Collabora Online< 25.04.702

Remediation

Fixed in
Collabora Online≥ 25.04.702

References

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Frequently asked

Is CVE-2025-66208 being actively exploited?

CVE-2025-66208 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.08%.

How severe is CVE-2025-66208?

CVE-2025-66208 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.08% probability of exploitation.

Which products are affected by CVE-2025-66208?

Affected products include Collabora Online.

How do I fix CVE-2025-66208?

Upgrade affected software to a fixed version, for example Collabora Online 25.04.702 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66208 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.