CVE-2026-84990
Received Received - Intake

ntopng Backup Disclosure via Authenticated Access

Publication date: 2026-09-21

Last updated on: 2026-09-21

Assigner: GitHub, Inc.

Description
ntopng is a web-based network traffic monitoring application. Prior to 6.7.260718, scripts/lua/rest/v2/get/system/configurations/list_available_backups.lua and scripts/lua/rest/v2/get/system/configurations/download_backup.lua allow any authenticated non-admin user to list and download system-configuration backups without an administrator check. The download path reaches backup_config.export_backup, and prefs_dump_utils.build_prefs_dump_table includes the ntopng.user.* Redis key space in the backup. A downloaded backup can therefore disclose password hashes for local users and, when configured, API tokens, TOTP secrets, and WebAuthn credential data, enabling account compromise through usable or recoverable credentials. This issue is fixed in version 6.7.260718.

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Meta Information

Published
2026-09-21
Last Modified
2026-09-21
Generated
2026-09-21
AI Q&A
2026-09-21
EPSS Evaluated
N/A
NVD
CVE-2026-84990
EUVD
EUVD-2026-83984

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
ntop ntopng 6.7.260718
ntop ntopng to 6.7.260718 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

CVE-2026-84990 is a vulnerability in ntopng versions 6.7.260717 and earlier that allows any authenticated user to download and list system configuration backups without proper authorization checks. The affected endpoints expose sensitive data including raw Redis dumps of all user credentials, API tokens, TOTP secrets, and WebAuthn credentials.

Detection Guidance

Check if ntopng is running versions 6.7.260717 or earlier. Inspect network traffic for unauthorized access to /rest/v2/get/system/configurations/list_available_backups.lua or /rest/v2/get/system/configurations/download_backup.lua endpoints. Review logs for non-admin user access to these paths.

Impact Analysis

Attackers can exploit this to download backups containing unsalted MD5 password hashes for all local users, API tokens, and other credentials. This enables offline cracking of admin passwords or direct access via API tokens, leading to full administrative compromise of the ntopng system.

Compliance Impact

This vulnerability likely violates compliance requirements for data protection and security due to unauthorized exposure of sensitive user credentials and configuration data. It could lead to breaches of confidentiality and integrity, potentially resulting in regulatory penalties under standards like GDPR or HIPAA.

Mitigation Strategies

Upgrade ntopng to version 6.7.260718 or later immediately. Ensure no unauthorized users have admin privileges. Review and rotate all credentials exposed in backups, including password hashes, API tokens, TOTP secrets, and WebAuthn data.

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