CVE-2026-51538

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.

• CWE-284

• https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2Third Party Advisory
• https://github.com/EIPStackGroup/OpENer/issues/565Exploit, Issue Tracking, Vendor Advisory
• https://github.com/EIPStackGroup/OpENer/issues/565Exploit, Issue Tracking, Vendor Advisory

Published

Jul 13, 2026

Last Modified

Aug 11, 2026

Status

Analyzed

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