Critical severity9.1NVD Advisory· Published Mar 13, 2026· Updated Apr 27, 2026

CVE-2026-25818

Description

HMS Networks Ewon Flexy with firmware before 15.0s4, Cosy+ with firmware 22.xx before 22.1s6, and Cosy+ with firmware 23.xx before 23.0s3 have weak entropy for authentication cookies, allowing an attacker with a stolen session cookie to find the user password by brute-forcing an encryption parameter.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Uozi/Cosyllm-fuzzy
Range: 22.xx < 22.1s6, 23.xx < 23.0s3
HMS Networks/Ewon Flexyllm-fuzzy
Range: <15.0s4

Patches

Vulnerability mechanics

References

hmsnetworks.blob.core.windows.net/nlw/docs/default-source/products/cybersecurity/security-advisory/hms-security-advisory-2026-03-09-001---ewon-several-flexy-and-cosy--vulnerabilities.pdfnvd
www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205nvd

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