Cyber Resilience

CVE-2026-31848

High

Published: 23 March 2026

Published
23 March 2026
Modified
26 March 2026
KEV Added
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Patch
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CVSS Score v4 8.7 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:X/V:X/RE:X/U:X
EPSS Score 0.0028 19.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-31848 is a high-severity Cleartext Storage of Sensitive Information (CWE-312) vulnerability in Amazonaws (inferred from references). Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 19.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A06:2025 Insecure Design

EU & UK References

Vulnerability details

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…

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valid cookie value without proper authentication. This allows unauthorized administrative access to protected endpoints.

CWE(s)
CWE-312

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1552 Unsecured Credentials Credential Access
Adversaries may search compromised systems to find and obtain insecurely stored credentials.
attack.mitre.org →
Why these techniques?

Reversible Base64 cookie with embedded credentials directly enables forging auth material for unauthorized admin access to a public-facing device (T1190) and exposes unsecured credentials (T1552).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

Amazonaws
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AT-3 Role-based Training
addresses: CWE-312

Training on secure data handling discourages cleartext storage of sensitive information.

CM-13 Data Action Mapping
addresses: CWE-312

Data action mapping can detect storage actions that leave sensitive information in cleartext.

CM-6 Configuration Settings
addresses: CWE-312

Configuration policies can mandate secure storage methods to avoid cleartext storage of sensitive information.

MP-1 Policy and Procedures
addresses: CWE-312

Policy requires protection measures such as encryption for sensitive data stored on media, preventing cleartext exposure.

SC-12 Cryptographic Key Establishment and Management
addresses: CWE-312

Key-management policy requires protected storage of key material, preventing cleartext storage of sensitive cryptographic keys.

SC-28 Protection of Information at Rest
addresses: CWE-312

Requiring confidentiality protection for information at rest eliminates cleartext storage of sensitive data on persistent media.

SC-38 Operations Security
addresses: CWE-312

Reduces cleartext storage of sensitive data when OPSEC identifies and mandates protection of key information artifacts.

References