A critical flaw in Nginx UI, identified as CVE-2026-27944, allows unauthorized access to server backups, posing a significant risk to organizations with exposed management interfaces. This vulnerability, with a CVSS score of 9.8, enables attackers to download and decrypt full server backups without authentication, potentially exposing sensitive configuration data, credentials, and encryption keys. The /api/backup endpoint is accessible without authentication, making it a prime target for malicious actors. This vulnerability expands the active attack surface, making it essential for organizations to prioritize mitigation based on their exposure and evidence of exploitation1. The disclosure of CVE-2026-27944 highlights the importance of securing management interfaces and prioritizing patching of critical vulnerabilities to prevent sensitive data exposure. So what matters to practitioners is that they must promptly assess their exposure to this vulnerability and take immediate action to secure their Nginx UI deployments.