CVE-2026-110447Collabora Online – Built-in CODE Server OS Command Injection Vulnerability

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.

9.2 CRITICALEPSS 73.30%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-30 16:32 UTC

OverviewCVSS details

9.2CRITICALCVSS 4.0

Score source: mitre (CNA)
NVD status: Analyzed
Published: Oct 14, 2026
Assigner: mitre

Affected

Collabora Online - Built-in CODE Server (Collabora)

Versions: before 26.4.303
Fixed in: 26.4.303

Exploitation

Public exploit: None listed
CISA KEV: Listed · Oct 23, 2026
KEV due date: Oct 26, 2026
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

73.30%chance of exploitation in 30 days

Higher than 99.46% of CVEs

CVSS 4.0 · mitre (CNA)

9.2Critical

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack vector: Network
Attack complexity: Low
Attack requirements: Present
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: High
Availability impact: High
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · NVD

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.2	CRITICAL	4.0mitre (CNA)	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA required action

⚡ Known exploited · remediation due Oct 26, 2026

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.

Details

CVE ID: CVE-2026-110447
Status: Analyzed
Assigner (CNA): mitre
Published: Oct 14, 2026
Last modified: 2026-10-30 16:32 UTC
Weaknesses: CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:13 UTC.