ntopng is a web-based network traffic monitoring application. In versions 6.7.0 through 6.7.260717, two REST v2 endpoints that manage ntopng's tag/badge feature — POST /lua/rest/v2/delete/tag/tag.lua and POST /lua/rest/v2/edit/tag/tag.lua — perform no authorization check at all. Any authenticated user, including a non-administrator ("unprivileged") account, can delete or rename any tag in the system, including tags created by an administrator. Version 6.7.260718 contains a fix.

ntopng before 6.7.260717 fails to perform authorization checks in the delete endpoints and recipients REST v2 handlers. Authenticated non-administrator users can issue POST requests to irreversibly delete all configured notification endpoints and recipients, silencing all alerts.

ntopng through 6.6 is vulnerable to Predictable Session Identifier which can lead to Session Hijacking. HTTP session identifiers in src/HTTPserver.cpp use weak time-seeded pseudo-randomness during session creation. As a result, fresh authenticated logins can receive deterministic or colliding session cookies under attacker-controlled timing.