# CVE-2026-27944

## Summary

- **CVE ID:** CVE-2026-27944
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-311, CWE-306
- **Published:** Mar 5, 2026
- **Last Modified:** Mar 19, 2026

## 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 (< 2.3.3)

## References

- [CNA](https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 22.16%
- **EPSS Percentile:** 97.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._