CVE-2026-31848
Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.7EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
23 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Nexxt Solutions · Nebula 300+Want to know if your infrastructure is exposed to this?
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