Is CVE-2026-25818 actively exploited?

No active exploitation of CVE-2026-25818 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-25818 be exploited remotely?

Yes. CVE-2026-25818 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25818?

CVE-2026-25818 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-25818

CWE-315Published: March 13, 2026· Updated: Mar 16, 2026

9.1

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:3.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-25818 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.