CVE-2026-110447: critical vulnerability in Collabora Online - Built-in CODE Server
Published
70Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck and has a public proof of concept.
ssvc Actcvss 9.2epss 1.2%
from disclosure to weapon0 days
Published on NVDOct 14
1st PoCOct 14
VulnCheckOct 14
exploitation probability
1.2%top 32% of all CVEs
observed exploitation
yesVulnCheck
2 public exploit(s)
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/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Collabora · Collabora Online - Built-in CODE Serverpublic PoCs found — 2
githubgithub.com/Iceman2050/cve-2026-110447-checker★ 0githubgithub.com/adriyansyah-mf/cve-2026-110447★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.