PT-2026-23481 · Nginx-Ui · Nginx-Ui

Tenbbughunters · Published 2026-03-05 · Updated 2026-03-23 · CVE-2026-27944

Positive Technologies · (AI Summary)

CVSS v2.0

10

Critical

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Nginx UI versions prior to 2.3.3

Description Nginx UI, a web user interface for the Nginx web server, contains a critical flaw. The /api/backup endpoint is accessible without authentication, and it discloses the encryption keys needed 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, including user credentials, session tokens, SSL private keys, and Nginx configurations, and decrypt it immediately. Exploitation is straightforward, requiring only a single HTTP GET request. The backup archive contains files like database.db, app.ini, server.key/cert, nginx.conf, and sites-enabled/*, all encrypted with AES-256-CBC, but the encryption keys are exposed in the HTTP response header. This vulnerability has been assigned a CVSS score of 9.8 (Critical).

Recommendations Update to version 2.3.3 or later.

Exploit

Fix

Missing Authentication

Missing Encryption of Sensitive Data

Weakness Enumeration

CWE-306

CWE-311

Related Identifiers

BDU:2026-02720

CVE-2026-27944

GHSA-G9W5-QFFC-6762

GO-2026-4614

Affected Products

Nginx-Ui

References · 68

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27944.json · Exploit
• https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27944 · Security Note
• https://osv.dev/vulnerability/GO-2026-4614 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-g9w5-qffc-6762 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-02720 · Security Note
• https://osv.dev/vulnerability/CVE-2026-27944 · Vendor Advisory
• https://github.com/0xJacky/nginx-ui · Note
• https://twitter.com/ZyberWallS/status/2031056770752458955 · Twitter Post
• https://twitter.com/TweetThreatNews/status/2030941683454521664 · Twitter Post
• https://twitter.com/TweetThreatNews/status/2031153075746902483 · Twitter Post
• https://twitter.com/r0otk3r/status/2032970144348070260 · Twitter Post
• https://t.me/CVEtracker/46473 · Telegram Post
• https://twitter.com/kpoireault/status/2031068747792887941 · Twitter Post
• https://twitter.com/piedpiper1616/status/2031508315721851328 · Twitter Post