Nexxt Solutions Nebula 300+ up to 12.01.01.37 Cookie ecos_pw risky encryption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Nexxt Solutions Nebula 300+ up to 12.01.01.37. Affected by this issue is some unknown functionality of the component Cookie Handler. This manipulation of the argument ecos_pw causes risky encryption. This vulnerability is tracked as CVE-2026-31848. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Nexxt Solutions Nebula 300+ up to 12.01.01.37 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Cookie Handler. The manipulation of the argument ecos_pw with an unknown input leads to a risky encryption vulnerability. The CWE definition for the vulnerability is CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was disclosed by Angel Barre. It is possible to read the advisory at nexxtsolutions.com. This vulnerability is known as CVE-2026-31848 since 03/09/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Nexxt Solutions

Name

• Nebula 300+

Version

• 12.01.01.0
• 12.01.01.1
• 12.01.01.2
• 12.01.01.3
• 12.01.01.4
• 12.01.01.5
• 12.01.01.6
• 12.01.01.7
• 12.01.01.8
• 12.01.01.9
• 12.01.01.10
• 12.01.01.11
• 12.01.01.12
• 12.01.01.13
• 12.01.01.14
• 12.01.01.15
• 12.01.01.16
• 12.01.01.17
• 12.01.01.18
• 12.01.01.19
• 12.01.01.20
• 12.01.01.21
• 12.01.01.22
• 12.01.01.23
• 12.01.01.24
• 12.01.01.25
• 12.01.01.26
• 12.01.01.27
• 12.01.01.28
• 12.01.01.29
• 12.01.01.30
• 12.01.01.31
• 12.01.01.32
• 12.01.01.33
• 12.01.01.34
• 12.01.01.35
• 12.01.01.36
• 12.01.01.37

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