HMS Ewon Flexy prior 15.0s4/22.1s6/23.0s3 Session Cookie improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in HMS Ewon Flexy. This impacts an unknown function of the component Session Cookie Handler. Such manipulation leads to improper authentication. This vulnerability is referenced as CVE-2026-25818. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in HMS Ewon Flexy. It has been rated as problematic. Affected by this issue is an unknown code block of the component Session Cookie Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality. CVE summarizes:

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.

The advisory is available at hms-networks.com. This vulnerability is handled as CVE-2026-25818 since 02/06/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 15.0s4, 22.1s6 or 23.0s3 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 9.1
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Ewon Flexy 15.0s4/22.1s6/23.0s3

Timelineinfo

02/06/2026 CVE reserved
03/13/2026 +35 days Advisory disclosed
03/13/2026 +0 days VulDB entry created
03/20/2026 +7 days VulDB entry last update

Sourcesinfo

Advisory: hms-networks.com
Status: Confirmed

CVE: CVE-2026-25818 (🔒)
GCVE (CVE): GCVE-0-2026-25818
GCVE (VulDB): GCVE-100-350810

Entryinfo

Created: 03/13/2026 07:27
Updated: 03/20/2026 05:49
Changes: 03/13/2026 07:27 (54), 03/15/2026 04:38 (11), 03/20/2026 05:49 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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