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CVE-2026-27944— Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure

Quick assessment

Affected
0xJacky nginx-ui
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.3之前版本存在安全漏洞，该漏洞源于/api/backup端点无需身份验证即可访问并泄露加密密钥，可能导致未经验证的攻击者下载并解密包含敏感数据的完整系统备份。

CVSS 9.8 · Critical EPSS 1.01% · P62

Public Exploits 1

Nuclei · 1 CVE-2026-27944.yaml [template]
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I. Basic Information for CVE-2026-27944

Vulnerability Information
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Vulnerability Title
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据加密缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Nginx UI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.3之前版本存在安全漏洞，该漏洞源于/api/backup端点无需身份验证即可访问并泄露加密密钥，可能导致未经验证的攻击者下载并解密包含敏感数据的完整系统备份。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
0xJacky nginx-ui < 2.3.3 -

II. Public POCs for CVE-2026-27944

# POC Description Source Link Shenlong Link
1 Nginx UI < 2.3.3 contains an information disclosure vulnerability caused by unauthenticated access to /api/backup endpoint exposing encryption keys in X-Backup-Security header, letting unauthenticated attackers download and decrypt full system backups. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-27944.yaml POC Details
2 https://github.com/vulhub/vulhub/blob/master/nginx-ui/CVE-2026-27944/README.md POC Details
3 None https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/Nginx%20UI%20%E6%9C%AA%E6%8E%88%E6%9D%83%E5%A4%87%E4%BB%BD%E4%B8%8B%E8%BD%BD%E4%B8%8E%E5%8A%A0%E5%AF%86%E5%AF%86%E9%92%A5%E6%B3%84%E9%9C%B2%E6%BC%8F%E6%B4%9E%20CVE-2026-27944.md POC Details
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III. Intelligence Information for CVE-2026-27944

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Vendor Advisories for CVE-2026-27944 (1)

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-311

V. Comments for CVE-2026-27944

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