CVE-2026-27944

Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure

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

0xJacky · nginx-ui

CVSS v3.1 GITHUB

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

EPSS

1.01% chance of exploitation in the next 30 days, 63rd percentile

Nuclei

critical · CWE-306

Published

2026-03-05

Updated

2026-03-19

Proof-of-concept exploits (7)

• advisories/GHSA-g9w5-qffc-6762
• Skynoxk/CVE-2026-279449★ · 2026-03-14
• NULL200OK/CVE-2026-279444★ · 2026-03-10
• Goultarde/CVE-2026-27944-poc0★ · 2026-04-02
• jake-young-dev/CVE-2026-279441★ · 2026-05-06
• BimaBalance/Cve-2026-27944-Tools-Exploit1★ · 2026-07-05
• diamorphine666/CVE-2026-279440★ · 2026-10-03

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-27944.yaml

Vulhub environments (1)

• vulhub/vulhub/tree/master/nginx-ui/CVE-2026-27944

Security advisories

• 0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762

References

• CVE Record
• NVD entry

Related

• CVE-2025-40554
• CVE-2025-48703
• CVE-2025-41244
• CVE-2026-22730
• CVE-2026-3228
• CVE-2026-32302