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Vulnerability record · CVE-2026-31848 · published 23 March 2026

CVE-2026-31848: Nexxtsolutions nebula300plus firmware cleartext storage of sensitive data vulnerability

NNexxtsolutions · Nebula300plus Firmware

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.

8.7 CVSS 4.0 High EPSS 0.46% · top 62.9% CWE-312 · Cleartext storage of sensitive data
8.7CVSS 4.0 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
10 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip Product
https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.5CVE-2026-31847Nexxtsolutions nebula300plus firmware vulnerabilityHidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement…EPSS 0.68%7.7CVE-2026-31851Nexxtsolutions nebula300plus firmware improper restriction of authentication attempts vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout mechanisms on authentication int…EPSS 0.67%7.2CVE-2026-31849Nexxtsolutions nebula300plus firmware cross-site request forgery vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement CSRF protections on state-changing endpoints such as /goform/setS…EPSS 0.17%6.8CVE-2026-31850Nexxtsolutions nebula300plus firmware vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 stores sensitive information, including administrative credentials and WiFi pre-shar…EPSS 0.27%5.7CVE-2011-4723D-Link DIR-300 router stores passwords in cleartextThe D-Link DIR-300 router stores passwords in cleartext rather than in a protected form. Anyone who can reach the stored data can read credentials di…KEVEPSS 3.1%analysed

Source: NIST National Vulnerability Database (record CVE-2026-31848), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.