CVE-2026-66372

Received Received - Intake

Predictable Web Session Tokens in Affected Products

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: ICS-CERT

Description

The affected products use insufficiently random values, which allows web session tokens to be predictable, bounding token entropy to the seed space.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-09-15

Generated

2026-10-06

AI Q&A

2026-09-16

EPSS Evaluated

2026-10-04

NVD

CVE-2026-66372

EUVD

EUVD-2026-79953

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-337	A Pseudo-Random Number Generator (PRNG) is initialized from a predictable seed, such as the process ID or system time.

Attack-Flow Graph

Executive Summary

This vulnerability involves the use of insufficiently random values in the affected products, which makes web session tokens predictable. The token entropy is limited by the seed space, allowing attackers to guess or replicate valid session tokens.

Impact Analysis

An attacker could exploit this to hijack user sessions, gain unauthorized access to accounts, or perform actions on behalf of legitimate users. This could lead to data theft, account manipulation, or other malicious activities depending on the system's functionality.

Compliance Impact

This vulnerability may violate compliance requirements for data protection and session security, such as GDPR's data integrity and confidentiality principles or HIPAA's safeguards for protected health information. Predictable tokens undermine secure authentication, risking unauthorized access and data breaches.

Mitigation Strategies

Replace the insufficiently random value generation mechanism with a cryptographically secure random number generator to ensure session tokens are unpredictable.

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