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CVE-2026-83621— ntopng: Missing Authorization Check in REST API Allows Non-Admin Users to Tamper Threat Intelligence Blacklist URLs

Quick assessment

Affected
ntop ntopng
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ntopng 是一款基于 Web 的网络流量监控应用。在版本 6.7.260717 之前，位于 的 接口缺少管理员权限校验，且对任何已认证用户均会调用 函数。该接口的 、 、 和 参数允许非管理员用户将威胁情报下载重定向到攻击者控制的内容、禁用黑名单或阻止计划更新。这些变更会通过 Redis 持久化保存，并在后续重载时缺少底层授权保护，从而破坏 ntopng 威胁情报监控的完整性和可用性。此问题已在 6.7.260717 版本中修复。

CVSS 8.1 · High EPSS 0.53% · P44

Possible ATT&CK Techniques 2 AI

T1562.004 T1562.008

Affected Version Matrix 1

VendorProduct Version RangeStatus
ntop ntopng < 6.7.260717 affected
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I. Basic Information for CVE-2026-83621

Vulnerability Information
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Vulnerability Title
ntopng: Missing Authorization Check in REST API Allows Non-Admin Users to Tamper Threat Intelligence Blacklist URLs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ntop ntopng < 6.7.260717 -

II. Public POCs for CVE-2026-83621

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III. Intelligence Information for CVE-2026-83621

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Patches & Fixes for CVE-2026-83621 (2)

Other References for CVE-2026-83621 (1)

Same Patch Batch · ntop · 2026-09-21 · 3 CVEs total

CVE-2026-82412 8.8 HIGH ntopng: Remote Code Execution via OS Command Injection in Vulnerability-Scan REST API
CVE-2026-84990 8.8 HIGH ntopng: Missing Authorization on System Configuration Backup Download and Listing

IV. Related Vulnerabilities

Same product: ntopng
Same vendor: ntop
Same weakness: CWE-862

V. Comments for CVE-2026-83621

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