CVE-2026-110447

State: Published
Severity: 9.2 Critical
Published: Oct 14, 2026
Updated: Oct 24, 2026
Reserved: Oct 14, 2026

Description

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.

Scores

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

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
Collabora Online - Built-in CODE ServerCollabora	before 26.4.303Affected

References

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

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