CVE-2026-83621 ntopng: Missing Authorization Check in REST API Allows Non-Admin Users to Tamper Threat Intelligence Blacklist URLs
Non-admin users can modify threat intelligence blacklists in ntopng due to missing authorization checks, compromising monitoring integrity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83621?
CVE-2026-83621 is a high-severity missing authorization vulnerability in ntopng, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-83621?
How do I fix CVE-2026-83621?
No fix has been published for CVE-2026-83621 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-83621 being exploited?
There is no known exploitation of CVE-2026-83621 in the wild and no public exploit code.
Sources
Also known as AZL-103404, GHSA-ffg5-889g-f5q8, UBUNTU-CVE-2026-83621.