EUVD Vulnerability Catalog

EUVD-2026-88247

Severity: MEDIUM Base Score: 5.3 CVSS Version: 4.0

Vulnerability Description

The Kaon AR2140X router improperly issues session cookies in responses to unauthenticated HTTP requests. This vulnerability allows a remote attacker to obtain a valid session identifier without providing credentials, resulting in an authentication bypass. With this access, the attacker can perform unauthorized actions on upgrade-related functionalities. These actions can be abused to force the router to issue GET requests to arbitrarily chosen domains. This issue was identified in firmware versions up to 4.2.17. Status of newer versions remains unknown.

CVSS Vector Analysis

Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

▪ Attack Vector (AV): Adjacent Network

▪ Attack Complexity (AC): Low

▪ Attack Requirements (AT): None

▪ Privileges Required (PR): None

▪ User Interaction (UI): None

▪ Vulnerability Confidentiality Impact (VC): Low

▪ Vulnerability Integrity Impact (VI): Low

▪ Vulnerability Availability Impact (VA): None

▪ Subsequent Confidentiality Impact (SC): Low

▪ Subsequent Integrity Impact (SI): Low

▪ Subsequent Availability Impact (SA): None

Affected Vendors & Systems

Vendor Kaon

References & Advisory Links

https://cert.pl/en/posts/2026/09/CVE-2026-52748

Metadata Profile

Database Authority

European Union Agency for Cybersecurity (ENISA) EUVD

Assigner

CERT-PL

EPSS Probability

Known Aliases

CVE-2026-52749

Published On

2026-09-28

Last Updated

2026-09-28