CVE-2026-27944
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
CVSS v3
9.8
CRITICAL
EPSS Score
1.0 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
poc
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- github.com/0xJacky/Nginx-UIGoall versions · fixed in 2.3.3
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.
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-03-05
- Last Modified
- 2026-03-10
Frequently asked questions
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