TL;DR: The Collabora Online Built-in CODE Server, the Nextcloud
richdocumentscodeapp, has an unauthenticated OS command injection flaw. The vendor rates it Critical, 9.2 under CVSS v4.0. CISA added it to KEV on Oct 23. Disabling the app isn't enough: upgrade to 26.4.303 or remove it. (GHSA, CISA KEV)
| Item | Detail | Source |
|---|---|---|
| CVE / severity | CVE-2026-110447, vendor-rated Critical 9.2 (CVSS v4.0) | GHSA |
| Affected | Collabora Online Built-in CODE Server (Nextcloud richdocumentscode) |
GHSA |
| Impact | Unauthenticated OS command injection | GHSA |
| Exploitation | CISA KEV add Oct 23 | CISA KEV |
| Fix | Upgrade to 26.4.303, or remove the app. Disabling it is not enough | GHSA |
Last verified 2026-10-23Report an error: [email protected]