EIPStackGroup OpENer 2.3.0 Encapsulation access control

Summaryinfo

A vulnerability marked as problematic has been reported in EIPStackGroup OpENer 2.3.0. Affected is an unknown function of the component Encapsulation Handler. The manipulation leads to access control. This vulnerability is traded as CVE-2026-51538. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in EIPStackGroup OpENer 2.3.0. It has been rated as problematic. This issue affects an unknown code of the component Encapsulation Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality. The summary by CVE is:

EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control vulnerability in its handling of encapsulation sessions. When the server processes critical encapsulation commands, it verifies whether the provided session_handle exists in the global session list, but it fails to verify whether that handle belongs to the specific TCP connection issuing the request. Because there is no strong binding between a session handle and its originating socket, any attacker on the network can use a valid session handle created by another legitimate client to bypass access controls.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-51538 since 06/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/14/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• EIPStackGroup

Name

• OpENer

Version

• 2.3.0

Website

• Product: https://github.com/EIPStackGroup/OpENer/

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