CVE-2026-25818CRITICAL 9.1EPSS p3.9%

CVE-2026-25818CVE-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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.14% probability of exploitation · percentile 3.9% · 2026-06-19T12:03:05Z
Published2026-03-13
Last modified2026-04-27

Underlying weaknesses· 1

CWE-315

References

  1. https://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.pdf?sfvrsn=f7c027b8_13
  2. https://www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205

1

TypeTargetConfidenceTier
WeaknessCleartext Storage of Sensitive Information in a Cookiecwe-3150%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.