Security Policy Bypass Vulnerability in Opera Neon (CVE-2026-123139)
A security vulnerability has been identified in Opera Neon that allows an attacker to bypass security policies. This flaw permits circumvention of the browser's communication channel source verification. Users of Opera Neon without the latest security patch are at risk. The vendor, Opera, released an official security advisory on November 12, 2026, listing the vulnerability and providing guidance to obtain the required patch. This issue is tracked under CVE-2026-123139.
Entenda a falha
A vulnerabilidade
CVE-2026-123139 is a security policy bypass in Opera Neon, tied to improper verification of the source of a communication channel. The articles do not say what an attacker needs (network reach, authentication, user interaction) or what exactly they gain beyond circumventing the policy. Affected: Opera Neon builds without the latest security patch. The articles give no version numbers. Opera published an advisory on November 12, 2026, and CERT-FR republished it on November 13.
Como funciona
The articles do not describe the vulnerable process in detail. From the advisory title, the browser handles a communication channel and does not properly verify where messages on it come from. This lets a party that should not be trusted get past a security policy. The exact flow and the step where it fails are not stated.
Por que é vulnerável
According to the advisory title, the root cause is improper verification of the source of a communication channel, meaning the origin of the channel or its messages is not checked correctly. The articles do not explain why it went unnoticed or what the fix changes.
Como foi descoberta
The articles do not say who found the flaw or how. They only report that Opera published a security advisory on November 12, 2026, and that CERT-FR issued a notice on November 13 pointing to the vendor advisory for the patch. No exploitation in the wild is mentioned.
Explicação gerada por IA a partir da matéria e dos artigos, em 13/11/2026 12:23.
Linha do tempo
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Security Policy Bypass Vulnerability in Opera Neon (CVE-2026-123139)
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A security vulnerability has been identified in Opera Neon that allows an attacker to bypass security policies. This flaw permits circumvention of the browser's communication channel source verification. Users of Opera Neon without the latest security patch are at risk. The vendor, Opera, released an official security advisory on November 12, 2026, listing the vulnerability and providing guidance to obtain the required patch. This issue is tracked under CVE-2026-123139.