CVE-2026-31848
Received Received - Intake

Insecure Cookie Storage in Nexxt Nebula 300+ Enables Admin Access

Publication date: 2026-03-23

Last updated on: 2026-04-29

Assigner: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

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.

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Meta Information

Published
2026-03-23
Last Modified
2026-04-29
Generated
2026-07-06
AI Q&A
2026-03-23
EPSS Evaluated
2026-07-04
NVD
CVE-2026-31848
EUVD
EUVD-2026-14415

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nexxtsolutions nebula300plus_firmware to 12.01.01.37 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-312 The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.

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Executive Summary

This vulnerability exists in Nexxt Solutions Nebula 300+ firmware versions up to 12.01.01.37. The device stores administrative authentication information in a cookie named ecos_pw using a reversible Base64-encoded format combined with a static suffix. Because this encoding is reversible and predictable, an attacker who obtains or figures out the value of this cookie can create a valid administrative session without proper authorization.

Impact Analysis

An attacker who exploits this vulnerability can gain unauthorized administrative access to the affected device. This means they could potentially control the device, change configurations, disrupt network operations, or access sensitive information managed by the device.

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