Intel

CVE-2026-51538

opener_project opener: Sicherheitsluecke

criticalEPSS 0.5%

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.

Source: NVD (NIST)CVE.org (MITRE)cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

opener_projectopener

Metrics

XIEM Effective CVSS
9.1
Source: nvd-v3
EPSS percentile
42.5 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
82.08
Exploit maturity
no public PoC known
CVSS v3
9.1
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-07-13 22:16 UTC

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-08-11 16:38 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:*
    • Reference Type: MITRE: https://gist.github.com/MrAlaskan/8156ca3acd6754a9f66efede0a1351f2 Types: Third Party Advisory
    • Reference Type: MITRE: https://github.com/EIPStackGroup/OpENer/issues/565 Types: Exploit, Issue Tracking, Vendor Advisory
    • Reference Type: CISA-ADP: https://github.com/EIPStackGroup/OpENer/issues/565 Types: Exploit, Issue Tracking, Vendor Advisory

Linked advisories