CVE-2026-27944

critical · 9.8

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

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.

9.8

CVSS

22.2%

EPSS (exploit prob.)

98th

EPSS percentile

2026-03-05

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-306CWE-311

Affected products

Vendor	Product	Affected versions
nginxui	nginx_ui	< 2.3.3

Check a specific version with /api/v1/cve/match.

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-27944