CVE-2026-83621

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 58% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 21, 2026

Last Modified

September 23, 2026

Advisory Details (3)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit 669589fe208f (ntop/ntopng)

Fix landed in ntop/ntopng commit 669589fe208f — awaiting tagged release

https://github.com/ntop/ntopng/commit/669589fe208fc932fe40a840e0de8e4d9df6023f
github_commit

commit 1d0627d802c5 (ntop/ntopng)

Fix landed in ntop/ntopng commit 1d0627d802c5 — awaiting tagged release

https://github.com/ntop/ntopng/commit/1d0627d802c59130c82478a4eb7f14014064eae5
github Patch Available🟡 PoC Available

Missing Authorization Check in REST API Allows Non-Admin Users to Tamper Threat Intelligence Blacklist URLs · Advisory · ntop/ntopng · GitHub

https://github.com/ntop/ntopng/security/advisories/GHSA-ffg5-889g-f5q8

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 06:03 UTCVendor advisory
  2. 2026-09-24 18:00 UTCEG score recompute
  3. 2026-09-24 18:00 UTCVendor advisory
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 05:23 UTCEG score recompute
  6. 2026-09-24 05:23 UTCVendor advisory
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 17:20 UTCVendor advisory
  9. 2026-09-23 09:32 UTCVendor advisory
  10. 2026-09-22 21:30 UTCEG score recompute
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-21 21:23 UTCEG score recompute
  13. 2026-09-21 20:48 UTCEG score recompute
  14. 2026-09-21 17:25 UTCEG score recompute
  15. 2026-09-21 16:25 UTCEG score recompute
  16. 2026-09-21 16:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-83621?
CVE-2026-83621 is a high vulnerability published on September 21, 2026. ntopng is a web-based network traffic monitoring application. Prior to 6.7.260717, POST /lua/rest/v2/edit/system/editblacklist.lua in scripts/lua/rest/v2/edit/system/editblacklist.lua lacks an administrator check and calls listsutils.editList for any authenticated user. The listname, listenabled,…
When was CVE-2026-83621 disclosed?
CVE-2026-83621 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83621 actively exploited?
CVE-2026-83621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.6% of all scored CVEs.
What is the CVSS score of CVE-2026-83621?
CVE-2026-83621 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-83621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-83621, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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