PT-2026-27115 · Nexxt Solutions · Nebula 300+

Angel Barre · Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-31848

NVD

CVSS v4.0

8.7

High

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:X/V:X/RE:X/U:X

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 stores administrative authentication material in the ecos pw cookie using a reversible Base64-encoded format with a static suffix. An attacker who obtains or derives this cookie value can forge a valid administrative session and gain unauthorized access to the device.

Fix

Cleartext Storage of Sensitive Information

Weakness Enumeration

CWE-312

Related Identifiers

CVE-2026-31848

Affected Products

Nebula 300+

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-31848 · Security Note
• https://nexxtsolutions.com/connectivity/internal-products/ARN02304U6 · Note
• https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip · Note