Veeam's Backup & Replication software has been patched for seven critical vulnerabilities, including CVE-2026-21666, which carries a CVSS score of 9.9 and allows authenticated domain users to execute remote code on the Backup Server. These flaws, if exploited, could grant attackers control over backup systems, potentially leading to data breaches or system compromises. The vulnerabilities affect Veeam's software, highlighting the importance of prompt patching to prevent exploitation. Veeam's security updates address these issues, but users must apply the patches to protect their systems. The disclosure of CVE-2026-21666, in particular, expands the active attack surface, making it crucial for organizations to prioritize patches based on their exposure and exploitation evidence1. This matters to security practitioners because unpatched backup systems can become a gateway for attackers to gain access to sensitive data and disrupt business operations.