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.
Scoring
- CVSS: 9.8 (CRITICAL, 3.1)
- EPSS exploitation probability: Not yet available
- EPSS percentile: Not yet available
CISA KEV status
- Added to KEV: 2026-10-23
- Remediation due date: 2026-10-26
- Known ransomware campaign use: Unknown
Weakness types (CWE)
- CWE-78
References
More from Collabora
- No other tracked CVEs for this vendor yet.
More CRITICAL-severity vulnerabilities · All exploited vulnerabilities