CVE-2026-25818
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 4% of all known CVEs.
References
Related Vulnerabilities
Other CWE-315 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2018-19941 | High | 7.5 | 0.7% | - | Fix |
| CVE-2024-41290 | High | 8.1 | 0.4% | - | - |
| CVE-2024-24768 | Medium | 6.5 | 0.3% | - | - |
| CVE-2025-8528 | Low | 3.7 | 0.3% | - | - |
| CVE-2025-4537 | Low | 3.1 | 0.3% | - | - |
| CVE-2024-8644 | High | 7.5 | 0.3% | - | Fix |
Common questions
How do I fix CVE-2026-25818?
No published fix for CVE-2026-25818 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-25818 being actively exploited?
Not that we know of. CVE-2026-25818 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.14% is the estimated probability that it will be exploited in the next 30 days. That is higher than 4% of all scored CVEs.
How severe is CVE-2026-25818?
CVE-2026-25818 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2026-25818
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.