CVE-2026-25818 - Vulnerability Analysis

Overview

HMS Networks Ewon Flexy < 15.0s4, Cosy+ 22.xx < 22.1s6, and Cosy+ 23.xx < 23.0s3 contain weak entropy in authentication cookies, letting attackers with stolen session cookies brute-force encryption parameters to find user passwords, exploit requires stolen session cookie.

Severity & Score

Impact

Attackers with stolen session cookies can brute-force encryption parameters to recover user passwords, leading to account compromise.

Mitigation

Update to firmware versions 15.0s4, 22.1s6, 23.0s3 or later.

References

• 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
• https://www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Mar 14, 2026

🔴 CVE-2026-25818 - Critical (9.1) 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 u... 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-25818/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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