CVE-2026-110447: listed in the CISA KEV catalog

CVE-2026-110447 · EPSS 2% · KEV 2026-10-23 · patch available

Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208. This is an OS command injection in proxy.php when the CODE server isn't running (e.g., the product was recently restarted). The vulnerability is not present in standalone Collabora Online servers; only this deployment with CODE Server is affected.

Is CVE-2026-110447 exploited?

• Listed in the CISA KEV catalog on 2026-10-23.
• Federal remediation due 2026-10-26.
• EPSS puts exploitation in the next 30 days at 2%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

• Collabora · Collabora Online - Built-in CODE Server · >= 0, < 26.4.303

Is there a patch?

Yes. Update to one of these or later:

From Collabora's CVE record

What PlainSec published about CVE-2026-110447

• Collabora backdoors target credential stores as VCO flaws recur (2026-10-25)
• Collabora built-in CODE flaw plants web shells (2026-10-16)

Primary sources

• NVD record
• CISA KEV catalog

What this record does not say

• No CVSS score from NVD.

KEV and EPSS are re-checked daily. Record last updated 2026-10-24.