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

CVSS 9.8 · Critical EPSS 5.83% · P91
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
敏感数据加密缺失
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
0xJackynginx-ui < 2.3.3 -

II. Public POCs for CVE-2026-27944

#POC DescriptionSource LinkShenlong Link
1Nginx 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.yamlPOC Details
2https://github.com/vulhub/vulhub/blob/master/nginx-ui/CVE-2026-27944/README.mdPOC Details
3Nonehttps://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.mdPOC Details
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III. Intelligence Information for CVE-2026-27944

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IV. Related Vulnerabilities

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

V. Comments for CVE-2026-27944

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