---
title: "CVE-2026-110447: Collabora Online - Command Injection"
description: "Collabora Online Built-in CODE Server before 26.4.303 contains a command injection caused by improper handling in proxy.php when the CODE server is not running, letting remote attackers execute OS commands, exploit requires CODE server to be stopped."
url: https://panop.io/threat-heartbeat/CVE-2026-110447/
---

# CVE-2026-110447 Collabora Online - Command Injection

Collabora Online Built-in CODE Server before 26.4.303 contains a command injection caused by improper handling in proxy.php when the CODE server is not running, letting remote attackers execute OS commands, exploit requires CODE server to be stopped.

CVSS base score 9.2 /10

Critical

CISA KEV

Exploited in the wild

Public exploit

Proof of concept available

Authentication

Not required

EPSS

1.23% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-110447)

## Details

Type

Command Injection

Impact

Remote Code Execution

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-78](https://cwe.mitre.org/data/definitions/78.html)

## Vendor fix

Upgrade to version 26.4.303 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-110447](https://nvd.nist.gov/vuln/detail/CVE-2026-110447)
- [https://www.cve.org/CVERecord?id=CVE-2026-110447](https://www.cve.org/CVERecord?id=CVE-2026-110447)
- [https://github.com/CollaboraOnline/richdocumentscode/issues/354](https://github.com/CollaboraOnline/richdocumentscode/issues/354)
- [https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516](https://help.nextcloud.com/t/to-collabora-built-in-user-update-asap/250516)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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