CVE-2026-86091

The NetworkInterface::getHost function in ntopng before version 3.0 allows remote attackers to cause an application crash via a NULL pointer dereference when a field that should contain a hostname or IP address is empty.

Ntopng versions before 3.0 allow HTTP Response Splitting.

CSRF vulnerability in ntopng version 2.4 allows remote attackers to hijack the authentication of arbitrary users. Examples of exploitation include admin/add_user.lua, admin/change_user_prefs.lua, admin/delete_user.lua, and admin/password_reset.lua.

A vulnerability in ntopng up to version 6.6 allows predictable session identifiers, leading to session hijacking. HTTP session IDs are generated using weak time-seeded pseudo-randomness, making them deterministic or collision-prone.

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260718, scripts/lua/rest/v2/get/system/configurations/list_available_backups.lua and scripts/lua/rest/v2/get/system/configurations/download_backup.lua allow any authenticated non-admin user to list and download system-configuration backups without an administrator check. The download path reaches backup_config.export_backup, and prefs_dump_utils.build_prefs_dump_table includes the ntopng.user.* Redis key space in the backup. A downloaded backup can therefore disclose password hashes for local users and, when configured, API tokens, TOTP secrets, and WebAuthn credential data, enabling account compromise through usable or recoverable credentials. This issue is fixed in version 6.7.260718.

In ntopng prior to 6.7.260717, the POST /lua/rest/v2/edit/system/edit_blacklist.lua endpoint 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.

In ntopng prior to 6.7.260717, the vulnerability-scan endpoints scripts/lua/rest/v2/add/host/to_scan.lua and scripts/lua/rest/v2/exec/host/schedule_vulnerability_scan.lua accept the scan_ports parameter without an administrator gate and pass it through validateSingleWord, which permits shell metacharacters. The parameter is then concatenated into an nmap command and executed through ntop.execCmd or ntop.execCmdAsync and popen.

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 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.