CVE-2020-4077: 
JavaScript vulnerability analysis and mitigation

A context isolation bypass vulnerability was discovered in Electron (CVE-2020-4077) affecting versions before 7.2.4, 8.2.4, and 9.0.0-beta21. The vulnerability was disclosed on July 6, 2020, impacting applications that use both contextIsolation and contextBridge features (GitHub Advisory).

The vulnerability allows code running in the main world context in the renderer to breach the isolation boundary and access the isolated Electron context, potentially performing privileged actions. This fundamentally undermines the security model of context isolation, which is designed to separate privileged and unprivileged execution contexts (GitHub Advisory, Debian Tracker).

When exploited, this vulnerability allows malicious code to bypass the context isolation security mechanism and perform privileged actions within the Electron context, potentially compromising the security boundaries established by the application (GitHub Advisory).

The vulnerability affects applications specifically using both contextIsolation and contextBridge features. No public exploits were documented at the time of disclosure (GitHub Advisory).

The vulnerability has been fixed in Electron versions 9.0.0-beta.21, 8.2.4, and 7.2.4. There are no app-side workarounds available, and users must update their Electron version to be protected (GitHub Advisory).