Critical severity · published Oct 14, 2026
CVE-2026-110447
Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
In wildKEV
9.8
CVSS
11.6%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)11.6% · higher than 96% of CVEs
Exploited in the wildYes
CISA KEVListed Oct 23, 2026
Federal remediation dueOct 26, 2026
Ransomware campaign useNot known
Affected products
Which versions
CO
ON
Online · Collabora
before 26.4.303 · source: NVD
CO
Collabora Online – Built-in CODE Server · Collabora
All versions, or not specified · source: KEV
In the news
VulnerabilityCritical
U.S. CISA adds Collabora Online flaw to its Known Exploited Vulnerabilities catalog
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Collabora Online flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a Collabora Collabora Online – Built-in CODE Server flaw, tracked as CVE-2026-110447 (CVSS score of 9.2), to its Known Exploited Vulnerabilities (KEV) catalog. Collabora Online – Built-in CODE Server is […]
Oct 24, 2026·Security Affairs
VulnerabilityCritical
CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added two vulnerabilities impacting Collabora Online Built-in CODE Server and Arista VeloCloud Orchestrator (VCO) to its Known Exploited Vulnerabilities (KEV), citing reports of active exploitation in the wild. The critical-severity vulnerabilities are listed below - CVE-2026-110447 (CVSS score: 9.2) - An operating
Oct 24, 2026·The Hacker News
VulnerabilityHigh
CISA Adds One Known Exploited Vulnerability to Catalog
CISA has added one new vulnerability to its  Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-110447 Collabora Online – Built-in CODE Server OS Command Injection Vulnerability  This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of  KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the  specified criteria . Aware of an exploited vulnerability not currently listed in the KEV Catalog? Su...
Oct 23, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-110447: Collabora Collabora Online – Built-in CODE Server - Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
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.
COCollabora Online – Built-in CODE ServerCVE-2026-110447
Oct 23, 2026·CISA KEV
VulnerabilityCritical
Hackers exploit Collabora RCE flaw to backdoor Nextcloud servers
Threat actors are exploiting a critical command execution flaw, now tracked as CVE-2026-110447, in the Collabora Online - Built-in CODE Server app (richdocumentscode) for Nextcloud. [...]
Oct 15, 2026·BleepingComputer