Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 32.3%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-51538
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cpe:2.3:a:opener_project:opener:2.3.0