CVE-2026-27944 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2026-27944 requires immediate attention.

· 3 min read

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Executive Summary

A critical vulnerability (CVE-2026-27944) has been identified in the github.com/0xJacky/Nginx-UI package, allowing unauthenticated access to sensitive backup data through the /api/backup endpoint. This flaw exposes encryption keys in the response headers, enabling attackers to download and decrypt full system backups containing user credentials, session tokens, and SSL private keys.

Immediate Action

  • Immediately disable the /api/backup endpoint or implement authentication if not already in place.
  • Review and rotate all encryption keys and sensitive data stored within backups.
  • Monitor your systems for unauthorized access or unusual activity.
  • Check for updates or patches from the vendor to address this vulnerability.
  • Consider isolating the affected service until a fix is applied.

Affected Versions

  • github.com/0xJacky/Nginx-UI@<=2.3.2 vulnerable; upgrade to 2.3.3+

Resolution Guide

To mitigate this vulnerability, follow these steps:

go get github.com/0xJacky/Nginx-UI@2.3.3

For those unable to upgrade immediately, consider disabling the /api/backup endpoint:

func InitRouter(r *gin.RouterGroup) {
    // r.GET("/backup", CreateBackup)  // Comment out this line to disable backup access
    r.POST("/restore", middleware.EncryptedForm(), RestoreBackup)  // Keep restore endpoint secured
}

Detection & Verification

To check if your version is vulnerable, run:

go list -m all | grep github.com/0xJacky/Nginx-UI

To verify the fix, ensure the /api/backup endpoint requires authentication by attempting to access it without valid credentials. A failure response should be returned.

Risk and Impact

If exploited, this vulnerability allows attackers to gain full access to sensitive backups, including user credentials and SSL keys, significantly increasing the risk of data breaches and unauthorized access to your systems. The potential impact includes data theft, service disruption, and reputational damage.

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