Description
Improper verification of the source of a communication channel vulnerability in Opera Neon on macOS and Windows allows a malicious browser extension to take control of the browser by sending commands through MCP Hub to the built-in Browser Operator extension. This issue affects Opera Neon MCP Hub extension: 0.0.1.
Published: 2026-11-12
Score: 5.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 12 Nov 2026 12:30:00 +0000

Type Values Removed Values Added
Description Improper verification of the source of a communication channel vulnerability in Opera Neon on macOS and Windows allows a malicious browser extension to take control of the browser by sending commands through MCP Hub to the built-in Browser Operator extension. This issue affects Opera Neon MCP Hub extension: 0.0.1.
Weaknesses CWE-940
References
Metrics cvssV4_0

{'score': 5.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/E:U'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: Opera

Published:

Updated: 2026-11-12T12:22:07.291Z

Reserved: 2026-11-05T14:21:01.547Z

Link: CVE-2026-123139

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-12T13:17:11.573

Modified: 2026-11-12T13:17:11.573

Link: CVE-2026-123139

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-940

    Improper Verification of Source of a Communication Channel