Nginx-UI Vulnerable to Unauthenticated Backup Download with Encryption Key Disclosure

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-27944: 22.84% estimated exploitation activity in the next 30 days; percentile 97.74 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Vulnerability Details | Field | Value | |-------|-------| | CWE | CWE-306: Missing Authentication for Critical Function + CWE-311: Missing Encryption of Sensitive Data | | Affected File | api/backup/router.go | | Affected Function | CreateBackup (lines 8-11 in router, implementation in api/backup/backup.go:13-38) | | Secondary File | internal/backup/backup.go | | CVSS 3.1 | 9.8 (Critical) | | CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | Root Cause The vulnerability exists due to two critical security flaws: 1. Missing Authentication on /api/backup Endpoint In api/backup/router.go:9, the backup…

Published by the source

5 Mar 2026, 18:26 UTC

Last modified by the source

5 Mar 2026, 22:37 UTC

Source last checked

26 Oct 2026, 15:15 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-g9w5-qffc-6762

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# Patch Next advisory brief: CVE-2026-27944

Advisory: Nginx-UI Vulnerable to Unauthenticated Backup Download with Encryption Key Disclosure
IDs: CVE-2026-27944, GHSA-g9w5-qffc-6762
Record: https://patchnext.com/advisories/cve-2026-27944 (revision 1, source checked 26 Oct 2026, 15:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/0xJacky/Nginx-UI 2.3.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/0xJacky/Nginx-UI: affected < 2.3.3; fixed in 2.3.3

## Suggested inspection (read-only)
- Go github.com/0xJacky/Nginx-UI: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/0xJacky/Nginx-UI.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-g9w5-qffc-6762 (GitHub-reviewed advisory GHSA-g9w5-qffc-6762 lists affected ranges: Go github.com/0xJacky/Nginx-UI >=0 <2.3.3)

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