CVE-2026-25818

Name: CVE-2026-25818
Creator: NVD / NIST
Published: 2026-03-13T19:54:27.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.14%

Last modified Jun 17, 2026

CVE-2026-25818 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.14%

3.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-315

References

Timeline

Published: Mar 13, 2026
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-25818?

How severe is CVE-2026-25818?

CVE-2026-25818 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25818?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25818?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST