Is CVE-2026-25818 in the CISA KEV catalog?

No. CVE-2026-25818 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-25818 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2026-25818?

CVE-2026-25818 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate 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.

CVE & CISA-KEV Catalog

CVE-2026-25818

CRITICAL

9.1

CVSS v3

NVD

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.

CWE-315

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Other references2

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-2024-8644	High	7.5	0.3%	-	Fix
CVE-2025-4537	Low	3.1	0.3%	-	-

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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.