CVE-2026-110447

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.

CVSS 4.0

9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

12% chance of exploitation in the next 30 days; higher than 96% of CVEs (scores of 2026-10-25)

CISA KEV

listed 2026-10-23, due 2026-10-26

CWE

CWE-78

Published

2026-10-14

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://github.com/CollaboraOnline/richdocumentscode/issues/354
• https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-110447

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