Vulnerability in ntopng (CVE-2026-83621)
Summary
Vulnerability in ntopng (CVE-2026-83621). Data can be tampered with by attackers. Exploitable via POST /lua/rest/v2/edit/system/edit_blacklist.lua.
Original description
The description as published by the source.
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: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-83621 has been found in ntopng.
Attackers can target a specific entry point like POST /lua/rest/v2/edit/system/edit_blacklist.lua over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 8.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "ntopng CVE-2026-83621" on the vendor's site.
CVE-2026-83621 (ntopng) — CWE-862 / CVSS v3 8.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: POST /lua/rest/v2/edit/system/edit_blacklist.lua
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-862) exists in ntopng. Attackers reach the vulnerable code path via POST /lua/rest/v2/edit/system/edit_blacklist.lua.
Check the vendor advisory for the affected versions of ntopng. Attack surface: POST /lua/rest/v2/edit/system/edit_blacklist.lua.
Severity: High (CVSS 8.1/10). Data can be tampered with by attackers.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /lua/rest/v2/edit/system/edit_blacklist.lua requests with malformed payloads or SQL meta-characters. Run grep -r 'ntopng' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'ntopng' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
ntopngを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /lua/rest/v2/edit/system/edit_blacklist.lua' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /lua/rest/v2/edit/system/edit_blacklist.luaへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Post-deployment verification verify
Replay attack against POST /lua/rest/v2/edit/system/edit_blacklist.lua on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com