Barracuda Vulnerabilities Chain to Grant Attackers Root Access
Barracuda has disclosed two critical vulnerabilities that can be chained together to allow attackers to bypass authorization and gain root access to affected devices.
Barracuda has alerted customers to a critical vulnerability chain affecting several of its products, which, if exploited, could grant attackers root-level privileges on compromised devices. The chain involves two distinct vulnerabilities: CVE-2026-116606, a pre-authentication authorization bypass flaw with a high CVSS score of 9.3, and CVE-2026-111560, a command injection vulnerability rated at 8.6.
While the authorization bypass vulnerability, CVE-2026-116606, specifically impacts the Barracuda Email Security Gateway, the command injection vulnerability, CVE-2026-111560, has a broader reach. It affects multiple Barracuda products, including the Email Security Gateway, Load Balancer Application Delivery Controller, Message Archiver, WAF Control Center, Web Application Firewall, and Web Security Gateway.
According to Barracuda's advisory, successful exploitation of this vulnerability chain requires an attacker to have access to the administrative interface of an affected product. This implies that devices with their administrative interfaces exposed directly to the internet are at a higher risk. However, the combination of these two flaws allows for a significant escalation of privileges, moving beyond mere unauthorized access to full root control.
To mitigate the risk, Barracuda strongly advises customers to restrict access to their administrative interfaces, ensuring they are only accessible from trusted internal networks. Implementing robust network access controls is also recommended to limit the exposure of these interfaces to the broader internet. Organizations that have not followed these best practices may find themselves more vulnerable to this attack vector.
Barracuda also emphasized the importance of maintaining up-to-date firmware on all affected devices. Customers are urged to verify that their systems are running the latest firmware versions and have applied all available security patches. In cases where a device's firmware is significantly outdated, multiple updates may be necessary to reach the most secure state and fully remediate the vulnerabilities.
The disclosure highlights the ongoing threat posed by chained vulnerabilities, where the combination of seemingly less severe flaws can lead to a critical security outcome. This incident underscores the need for continuous vigilance in patching and securing network infrastructure, particularly for devices that manage critical security functions or house sensitive data.
While Barracuda has provided clear guidance on mitigation and patching, the potential for attackers to leverage these chained vulnerabilities for deep system compromise remains a significant concern for organizations relying on Barracuda's security products. The company's proactive disclosure and recommended steps aim to help customers protect themselves from potential exploitation.