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

9.2

EPSS

0.012 (68.2th percentile)

CISA KEV

Not listed

Exploitation

none

Public exploits

None seen

State

PUBLISHED

Coverage

• BleepingComputer◆Authoritative. Authoritative publisher: a primary source, or a newsroom with formal editorial standards2 hours ago

  Hackers exploit Collabora RCE flaw to backdoor Nextcloud servers

  Threat actors are exploiting a critical command execution flaw, now tracked as CVE-2026-110447, in the Collabora Online - Built-in CODE Server app (richdocumentscode) for Nextcloud. [...]

  ↗bleepingcomputer.com/news/security/hackers-expl…(opens the publisher's site in a new tab)

What we observed