What’s Vulnerable › Vulnerabilities
CVE-2026-27944: Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 22.9% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-05 · updated 2026-06-17
- Weakness: CWE-306
Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header. This allows an unauthenticated attacker to download a full system backup containing sensitive data (user credentials, session tokens, SSL private keys, Nginx configurations) and decrypt it immediately. This issue has been patched in version 2.3.3.
Affected products
- 0xJacky nginx-ui: before 2.3.3 — fixed in 2.3.3
How to fix
Upgrade to a fixed version: 0xJacky nginx-ui 2.3.3. Check the vendor advisory for mitigations.
References
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