CVE-2026-51538
criticalpriority · track · 0EPSS 0.005 · 44 %ileEUUSEPSS · scored 2026-10-28
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (6)
External citations — patches, advisories, analysis.
- https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2cnnvd
- https://github.com/EIPStackGroup/OpENer/issues/565cnnvd
- https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2enisa_euvd
- https://github.com/EIPStackGroup/OpENer/issues/565enisa_euvd
- https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2Third Party Advisorynvd
- https://github.com/EIPStackGroup/OpENer/issues/565ExploitIssue TrackingVendor Advisorynvd
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