CVE-2026-31848— Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
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I. Basic Information for CVE-2026-31848
Vulnerability Information
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Vulnerability Title
Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
Source: NVD (National Vulnerability Database)
Vulnerability 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. This allows unauthorized administrative access to protected endpoints.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
敏感数据的明文存储
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nexxt Solutions Nebula 300+ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nexxt Solutions Nebula 300+是美国Nexxt Solutions公司的一款无线路由器。 Nexxt Solutions Nebula 300+ 12.01.01.37及之前版本存在安全漏洞，该漏洞源于身份验证材料存储不当，可能导致伪造有效管理会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Nexxt Solutions | Nebula 300+ | <= 12.01.01.37 | - |
II. Public POCs for CVE-2026-31848
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Nexxt Solutions · 2026-03-23 · 6 CVEs total
| CVE-2026-31846 | 6.5 MEDIUM | Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+ |
| CVE-2026-31849 | Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+ | |
| CVE-2026-31847 | Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Neb | |
| CVE-2026-31850 | Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+ | |
| CVE-2026-31851 | Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt Nebula 300+ |
IV. Related Vulnerabilities
Same product: Nebula 300+
Same vendor: Nexxt Solutions
- CVE-2026-31851
Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt N - CVE-2026-31850
Plaintext Storage of Credentials in Configuration Backup in - CVE-2026-31849
Missing CSRF Protection on Administrative Endpoints in Nexxt - CVE-2026-31847
Hidden Functionality Enables Remote Telnet Activation via /g - CVE-2026-31846
Unauthenticated Credential Disclosure via /goform/ate in Nex
Same weakness: CWE-312
- CVE-2026-7163
Assisted-service: assisted-service: authenticated users can - CVE-2026-41385
OpenClaw < 2026.3.31 - Nostr Private Key Exposure via config - CVE-2026-6553
TYPO3 CMS Stores Cleartext Password in User Settings Module - CVE-2026-35644
OpenClaw < 2026.3.22 - Credential Exposure via baseUrl Field - CVE-2025-14815
Information Disclosure, Tampering, and Denial-of-Service Vul
V. Comments for CVE-2026-31848
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