Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Opener Project | Opener | 2.3.0 |
Related Weaknesses (CWE)
References
- https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2Third Party Advisory
- https://github.com/EIPStackGroup/OpENer/issues/565ExploitIssue TrackingVendor Advisory
- https://github.com/EIPStackGroup/OpENer/issues/565ExploitIssue TrackingVendor Advisory
FAQ
What is CVE-2026-51538?
CVE-2026-51538 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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,...
How severe is CVE-2026-51538?
CVE-2026-51538 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-51538?
Check the references section above for vendor advisories and patch information. Affected products include: Opener Project Opener.