CVE-2026-110447
Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
Collabora Collabora Online – Built-in CODE Server
CVSS
9.2CriticalExploit odds (EPSS)1.23%Chance of exploitation activity in the next 30 days, higher than 68% of CVEs. Scored 23 Oct 2026FIRST EPSS
CISA required actionApply 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. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance
What fixes it
- 26.4.303Collabora Online - Built-in CODE ServerCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Timeline
- 14 Oct 2026, 02:27 UTCPublishedCVE List
- 23 Oct 2026, 12:00 UTCFirst reported exploitedCISA advisories
- 23 Oct 2026Added to CISA KEVCISA KEV
Vendor and government advisories 1
Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.
Reports 4
2 outlets report exploitation. Reports are not confirmation; each links to its source.
- @mariogalarza.bsky.social: CISA added CVE-2026-110447 to the KEV catalog: OS command injection in Collabora Online's CODE server, actively exploited. Patch your Nextcloud document stack and hunt for pre-patcBluesky: CVE posts, 23 Oct 2026Exploitation reported
- @ninjaintelgroup.bsky.social: 🚨 NEW on CISA KEV — exploited in the wild Collabora Collabora Online – Built-in CODE Server: Collabora Online – Built-in CODE Server OS Command Injection Vulnerability CVE-2026-110Bluesky: CVE posts, 23 Oct 2026Exploitation reported
- @aipostdaily.bsky.social: CISA added CVE-2026-110447 to its Known Exploited Vulnerabilities list (2026-10-23). Collabora Online – Built-in CODE Server OS Command Injection EPSS today: 0.012 (no score 30 dayBluesky: CVE posts, 23 Oct 2026Exploitation reported
- CISA Adds One Known Exploited Vulnerability to CatalogCISA advisories, 23 Oct 2026Exploitation reported
Description
Collabora Collabora Online – Built-in CODE Server when used within the NextCloud platform contains an OS command injection vulnerability that allows for remote code execution when the CODE server isn't running.
Text from CVE List
Affected versions 1
- Collabora Online - Built-in CODE Serveraffected: all versions before 26.4.303CVE List
References 5
- help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516Advisoryvia CVE List
- github.com/CollaboraOnline/online/security/advisories/GHSA-g3vx-3m76-fghhAdvisoryvia CISA KEV
- nvd.nist.gov/vuln/detail/CVE-2026-110447Referencevia CISA KEV
- github.com/CollaboraOnline/richdocumentscode/issues/354Referencevia CVE List
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-110447Referencevia CVE List