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CVE-2026-31848— Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+

Quick assessment

Affected
Nexxt Solutions Nebula 300+
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.7 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nexxt Solutions Nebula 300+ <= 12.01.01.37 affected
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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: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-31848

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Vendor Pages for CVE-2026-31848 (1)

Other References for CVE-2026-31848 (1)

Same Patch Batch · Nexxt Solutions · 2026-03-23 · 6 CVEs total

CVE-2026-31847 8.5 HIGH Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Neb
CVE-2026-31851 7.7 HIGH Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks
CVE-2026-31849 7.2 HIGH Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+
CVE-2026-31850 6.8 MEDIUM Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+
CVE-2026-31846 6.5 MEDIUM Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+

IV. Related Vulnerabilities

Same product: Nebula 300+
Same vendor: Nexxt Solutions
Same weakness: CWE-312

V. Comments for CVE-2026-31848

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