CVE-2026-27944CRITICAL 9.8EPSS p97.4%
CVE-2026-27944CVE-2026-27944
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 22.16% probability of exploitation · percentile 97.4% · 2026-06-18T12:00:27Z |
| Published | 2026-03-05 |
| Last modified | 2026-03-10 |
Underlying weaknesses· 2
References
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Missing Authentication for Critical Functioncwe-306 | 0% | live |
| Weakness | Missing Encryption of Sensitive Datacwe-311 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.