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CVE-2026-83621

8.1 · HIGH

ntopng is a web-based network traffic monitoring application.

Published Sep 21, 2026CWE-862EPSS 0.53%

Overview

CVE-2026-83621 is a high-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/ntop/ntopng/commit/1d0627d802c59130c82478a4eb7f14014064eae5GitHubgithub.com/ntop/ntopng/commit/669589fe208fc932fe40a840e0de8e4d9df6023fGitHubgithub.com/ntop/ntopng/security/advisories/GHSA-ffg5-889g-f5q8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-83621?

CVE-2026-83621 is a high-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-83621?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-83621?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-83621?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-83621 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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