Vulnerability · Published Mar 23, 2026 · Assigned by TuranSec
CVE-2026-31848Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
High 8.7
In plain English
A high-severity security flaw in Nebula 300+ from Nexxt Solutions. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.3%top 77.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nexxt Solutions | Nebula 300+ | <= 12.01.01.37 |
Weakness: CWE-312 · Vector: 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
References
- Official product page third-party-advisory
- Firmware download third-party-advisory