CVE-2026-31851: Nexxtsolutions NEBULA300PLUS Firmware

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout mechanisms on authentication interfaces. An attacker can perform unlimited authentication attempts against endpoints that rely on credential validation, enabling brute-force attacks to guess administrative credentials without restriction.

Affected products

• Nexxtsolutions NEBULA300PLUS Firmware: up to and including 12.01.01.37

Published 2026-03-23. Last modified 2026-06-17.