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

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

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Nexxt Solutions Nebula 300+ firmware versions through 12.01.01.37

Description The device stores administrative credentials within the ecos pw cookie using a reversible Base64 encoding with a static suffix. Obtaining or deriving this cookie allows an attacker to forge a valid administrative session and gain unauthorized access to the device.

Recommendations Update to a version later than 12.01.01.37.

Fix

Cleartext Storage of Sensitive Information

Weakness Enumeration

CWE-312

Related Identifiers

CVE-2026-31848

Affected Products

Nebula 300+

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-31848 · Security Note
• https://twitter.com/VulmonFeeds/status/2036137342084268469 · Twitter Post
• https://nexxtsolutions.com/connectivity/internal-products/ARN02304U6 · Note
• https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip · Note