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CVE-2026-123139

Quick assessment

Affected
Opera Neon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Opera Neon 在 macOS 和 Windows 平台上存在通信信道来源验证不当的漏洞。该漏洞允许恶意浏览器扩展通过 MCP Hub 向内置的 Browser Operator 扩展发送命令，从而接管浏览器控制权。此问题影响 Opera Neon MCP Hub 扩展版本 0.0.1。

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-123139

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道源的不正确验证
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Opera Neon 1.0.0 -

II. Public POCs for CVE-2026-123139

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III. Intelligence Information for CVE-2026-123139

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Other References for CVE-2026-123139 (1)

IV. Related Vulnerabilities

Same weakness: CWE-940