CVE-2026-27944
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
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.
INFO
Published Date :
March 5, 2026, 7:16 p.m.
Last Modified :
March 10, 2026, 6:11 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Nginx UI to version 2.3.3 or higher.
- Apply vendor-provided patches for Nginx UI.
- Remove unneeded API endpoints.
- Restrict access to sensitive endpoints.
Public PoC/Exploit Available at Github
CVE-2026-27944 has a 20 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27944.
| URL | Resource |
|---|---|
| https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27944 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27944
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
HTB machine
Python C HTML
One missing function call on the route registration was enough to turn the MCP interface into an unauthenticated RCE gateway.
Python Lua
基于 claude-agent-sdk 的智能渗透测试 Agent，用于参与第二届 TCH 智能渗透挑战赛。
Dockerfile Shell Python
Docker Compose setup to demonstrate the nginx-ui missing authentication vulnerability
Python HTML
Automated Attack Surface Management (ASM) & Rapid 0-Day/N-Day Detection
A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.
ai-agent-security ai-agents ai-security awesome-list cybersecurity llm-security mcp-security prompt-injection supply-chain-security adversarial-attacks agent-security agentic-ai ai-attacks ai-safety cve incident-response owasp red-team security-research vulnerability
poc for CVE-2026-27944
None
Python
Automated exploit script for CVE-2026-27944 (Nginx UI). Downloads/decrypts backups, extracts system secrets, and creates rogue admin accounts for full dashboard access.
Python
Nginx UI Discovery Scanner - CVE-2026-27944 Version Detector
Python
CVE-2026-27944 - Nginx UI Unauthenticated Backup Download & Decryption
Python
Educational lab demonstrating CVE-2026-27944 - Unauthenticated Backup Download with Encryption Key Disclosure in Nginx-UI < 2.3.2. Includes vulnerable server, PoC exploit, and CTF flags.
Dockerfile Python
None
Python C
Your single pane of glass for threat intel: a clean, public feed that highlights high‑value security updates and trends.
Python JavaScript CSS HTML
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27944 vulnerability anywhere in the article.
-
The Cyber Express
Critical nginx-ui Flaw (CVE-2026-33032) Enables Full Nginx Server Takeover
A critical vulnerability identified as CVE-2026-33032 is drawing urgent attention from the cybersecurity community due to its role in enabling a full-scale Nginx server takeover. The flaw affects ngin ... Read more
-
The Cyber Express
Pixel Watch Users Report Inflated Steps, Missing SpO2 Data
A recent Pixel firmware update released in March 2026 has sparked concern among Pixel Watch users, as reports of inaccurate Fitbit tracking, missing SpO2 readings, and inflated activity data continue ... Read more
-
The Cyber Express
Veeam Fixes RCE Bugs in Critical Backup & Replication Platform
An important Veeam security patch to address multiple vulnerabilities in its Backup & Replication platform that potentially allowed attackers to execute malicious code remotely, has been released. The ... Read more
-
The Cyber Express
Microsoft Patch Tuesday March 2026: Two Zero-Days and Critical RCE Bugs Fixed
The Microsoft Patch Tuesday March 2026 release introduces security updates addressing 79 vulnerabilities, including two publicly disclosed zero-day vulnerabilities and several high-risk issues tied to ... Read more
-
CybersecurityNews
Critical Nginx UI Vulnerabilities Allow Attacker to Download a Full System Backup
Nginx UI Vulnerabilities A newly discovered critical vulnerability in Nginx UI allows unauthenticated attackers to download and decrypt full system backups. Tracked as CVE-2026-27944, this flaw is cat ... Read more
-
The Cyber Express
Critical Nginx UI Vulnerability Exposes Server Backups and Sensitive Data
A newly disclosed vulnerability in Nginx UI, tracked as CVE-2026-27944, has raised major security concerns after researchers confirmed that attackers can download and decrypt server backups without au ... Read more
-
Daily CyberSecurity
Unauthenticated Nginx UI Flaw Leaks Decryption Keys and Server Secrets
Security researchers have uncovered a critical vulnerabilities in Nginx UI, a popular web-based interface used to manage and monitor Nginx server clusters. The flaw, tracked as CVE-2026-27944 with a m ... Read more
The following table lists the changes that have been made to the
CVE-2026-27944 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.3 Added Reference Type GitHub, Inc.: https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Mar. 05, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-306 Added CWE CWE-311 Added Reference https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762