# Critical Vulnerability in Collabora Exploited to Compromise Nextcloud Servers

*Published October 16, 2026*
*Source: [https://www.bleepingcomputer.com/news/security/hackers-exploit-collabora-rce-flaw-to-backdoor-nextcloud-servers/](https://www.bleepingcomputer.com/news/security/hackers-exploit-collabora-rce-flaw-to-backdoor-nextcloud-servers/)*

## Executive Summary

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## Article

A severe vulnerability within Collabora Online's CODE Server has been exploited by attackers to infiltrate and backdoor Nextcloud servers. This vulnerability, identified as CVE-2026-110447, involves a remote code execution flaw that permits unauthorized access, allowing attackers to plant web shells and establish persistent backdoors. The exploitation of this flaw puts sensitive data at risk and underscores the importance of timely patch management and security monitoring.

The breach highlights a critical security gap that organizations using these platforms must urgently address. Nextcloud, widely used for file sharing and collaboration, becomes a prime target for attackers once they gain access through the compromised Collabora component. This enables them to execute arbitrary code, leading to potential data breaches and unauthorized data access.

Organizations using Collabora Online should immediately verify if their systems are impacted and apply necessary patches or updates to mitigate this vulnerability. The incident serves as a reminder that even widely trusted open-source platforms are not immune to security threats. Continuous monitoring and incident response readiness are crucial in minimizing the impact of such vulnerabilities when they are exploited.

The importance of a robust security posture is further emphasized by findings in The Blue Report 2026, which evaluates security defenses across numerous environments. It reveals that once attackers have valid credentials, the effectiveness of prevention mechanisms significantly diminishes. This finding underscores the necessity for comprehensive security measures that go beyond basic prevention and include detection and response strategies.