---
id: CVE-2026-83621
title: ntopng is a web-based network traffic monitoring application
summary: >-
  ntopng is a web-based network traffic monitoring application. Prior to
  6.7.260717, POST /lua/rest/v2/edit/system/edit_blacklist.lua in
  scripts/lua/rest/v2/edit/system/edit_blacklist.lua lacks an administrator
  check and calls lists_utils.…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-862
vendor: ntop
product: ntopng
affected:
  - ntopng < 6.7.260717
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:50.090'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83621'
references:
  - url: >-
      https://github.com/ntop/ntopng/commit/1d0627d802c59130c82478a4eb7f14014064eae5
    label: security-advisories@github.com
  - url: >-
      https://github.com/ntop/ntopng/commit/669589fe208fc932fe40a840e0de8e4d9df6023f
    label: security-advisories@github.com
  - url: 'https://github.com/ntop/ntopng/security/advisories/GHSA-ffg5-889g-f5q8'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.0053
epssPercentile: 0.42436
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T19:40:33.282816Z'
ingestedAt: '2026-09-21T16:49:07.877Z'
---

## Overview

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260717, POST /lua/rest/v2/edit/system/edit_blacklist.lua in scripts/lua/rest/v2/edit/system/edit_blacklist.lua lacks an administrator check and calls lists_utils.editList for any authenticated user. The list_name, list_enabled, url, and list_update parameters allow a non-admin user to redirect threat-intelligence downloads to attacker-controlled content, disable blocklists, or prevent scheduled updates. The changes are persisted through Redis and reloaded without a lower-level authorization guard, undermining the integrity and availability of ntopng's threat-intelligence monitoring. This issue is fixed in version 6.7.260717.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.