Medium severityNVD Advisory· Published Nov 12, 2026

CVE-2026-123139

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Opera/Opera Neonllm-create
Range: = 0.0.1

Patches

Vulnerability mechanics

References

security.opera.com/en/improper-verification-of-source-of-a-communication-channel-opera-security-advisories/nvd

News mentions

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cvss	0.260
epss	0.000
exploit	0.000
kev	0.000
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ransomware	0.000