CVE-2026-39880: Remnawave Backend

Medium severity, CVSS 4.9. EPSS: 0.2% chance of exploitation in the next 30 days.

Remnawave Backend is the backend for the Remnawave proxy and user management solution. Prior to 2.7.5, a glitch in the HWID device registration logic allows an authenticated user to bypass the configured limit for HWID devices and register more devices than expected, allowing them to resell subscriptions and consume excessive traffic. This vulnerability is fixed in 2.7.5.

Affected products

• Remnawave Remnawave Backend: up to and including 2.7.4

Published 2026-04-08. Last modified 2026-07-24.