CVE-2026-16347: MikroTik Cloud Hosted Router
High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.
MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services.
Affected products
Published 2026-07-28. Last modified 2026-07-30.