MSRXCVE-2026-110447
CVE-2026-110447
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVSS 4.0 · CNA
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Affected products
- Collabora Collabora Online - Built-in CODE Server: < 26.4.303
Weakness: CWE-78
2 references (advisories, patches, write-ups)
- https://github.com/CollaboraOnline/richdocumentscode/issues/354 · issue-tracking
- https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516 · vendor-advisory
Sources: CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.