CVE-2026-110447 | BDVDB-2026-389477 Detail

CollaboraCollabora Online - Built-in CODE Server

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.

Impact#

Per CVSS v4.0: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

References#

Exploit#

No public exploit known

History#

Version 12026-10-14Record published in the CVE List.
Version 22026-10-24Most recent update recorded in the CVE List.

Published

Published: 2026-10-14
Last modified: 2026-10-24

Vendor information

Vendor: Collabora
Product: Collabora Online - Built-in CODE Server

All Collabora vulnerabilities

Score

9.2 Critical

EPSS

73.3%, High

Estimated chance of exploitation in the next 30 days. EPSS percentile: 99.5.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Command Injection

Action

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.

Affected Systems

Vulnerable
< 26.4.303
Fixed
26.4.303

Scoring System

CVSS v4.0

9.2 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).