{"id":"CVE-2026-70602","aliases":["GHSA-m55f-7gqj-fr98"],"url":"https://o3.security/vulnerability/CVE-2026-70602","summary":"Electron: Extension tab APIs operate across session boundaries","details":"### Impact\nExtension 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.\n\nApps 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.\n\n### Workarounds\nOnly load extensions from sources you trust; do not rely on session separation alone to contain an extension.\n\n### Fixed Versions\n* `42.0.0-beta.3`\n* `41.2.1`\n* `40.9.0`\n* `39.8.8`\n\n### For more information\nIf you have any questions or comments about this advisory, email Electron at [security@electronjs.org](mailto:security@electronjs.org)","published":"2026-08-05T15:54:49.931Z","modified":"2026-10-28T11:22:35.591538420Z","cvss":{"score":6.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N"},"epss":{"score":0.00209,"percentile":0.11322,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"electron","fixedVersion":"39.8.8"},{"ecosystem":"npm","name":"electron","fixedVersion":"40.9.0"},{"ecosystem":"npm","name":"electron","fixedVersion":"41.2.1"},{"ecosystem":"npm","name":"electron","fixedVersion":"42.0.0-beta.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70602.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-m55f-7gqj-fr98"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70602"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T11:22:35.591538420Z"}}