Dashboard / CVE-2026-123139

CVE-2026-123139

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 37/100
Published: 2026-11-12 Modified: 2026-11-12 First seen: 2026-11-12 Status: active

Attack Surface

Low Complexity No Auth Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: Passive
S: X
AT: None
VC: High
VI: High
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
Opera Neon 1.0.0

References & Advisories (1)

Bug Bounty Relevance

37 / 100
✓ No authentication
✓ Low complexity

CVSS Score

5.8 / 10.0 v4.0
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.12%
Raw Score 0.001210
Percentile 2.0%
Date 2026-11-13

Intelligence Sources

mitre ref →
nvd ref →

External Links