SEPTEMBER 13, 2026
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Case File

CVE-2026-51538

CRITICAL · CVSS 9.1 EPSS 0.39% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-13 · Last synced 2026-08-12

CyberRota Analysis

AI-Generated

The vulnerability in EIPStackGroup OpENer 2.3.0 allows attackers to exploit incorrect access control in encapsulation session handling, enabling them to bypass security measures by using valid session handles from other clients. This flaw can lead to unauthorized access to sensitive operations, posing a critical risk to network integrity. Organizations utilizing this software should prioritize immediate remediation to mitigate potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-51538
Severity
CRITICAL
CVSS
9.1
EPSS
0.39%

Original NVD Description

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.

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