CVE-2026-70602

### Impact Extension tab and scripting APIs were not scoped to the extension's own `session`. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session. Apps are only affected if they load Chrome extensions via `session.loadExtension` and rely on separate sessions to isolate that extension from other content. Apps that do not load extensions, or that use a single session, are not affected. ### Workarounds Only load extensions from sources you trust; do not rely on session separation alone to contain an extension. ### Fixed Versions * `42.0.0-beta.3` * `41.2.1` * `40.9.0` * `39.8.8` ### For more information If you have any questions or comments about this advisory, email Electron at [security@electronjs.org](mailto:security@electronjs.org)