Nexxtsolutions Nebula300Plus Firmware — CVE-2026-31848 (Critical)

Date Mar 23, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Nexxtsolutions · Nebula300Plus Firmware

CVE CVE-2026-31848

Critical vendor advisory CVE-2026-31848

Summary

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential data combined with a static suffix. Because the encoding is reversible and lacks integrity protection, an attacker can reconstruct or forge a valid cookie value without proper authentication. This allows unauthorized administrative access to protected endpoints.

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 9.8) in Nexxtsolutions Nebula300Plus Firmware. Patch or mitigate promptly.

Operator check

Review CVE-2026-31848 in your asset inventory. Apply patches per vendor guidance and verify Nebula300Plus Firmware is not exposed. CVSS score: 9.8.

Sources

NVD — CVE-2026-31848 Vendor reference Vendor reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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