{"id":"CVE-2020-4077","aliases":["EUVD-2020-0558","GHSA-h9jc-284h-533g"],"status":"published","title":"Context isolation bypass via contextBridge in Electron","description":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.01003,"percentile":0.63172,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-501"],"published":"2020-07-07T00:01:10Z","modified":"2026-10-20T10:53:28Z","fixes":[{"ecosystem":"npm","package":"electron","fixed_in":["8.2.4","7.2.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.2.4"}]}]},{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.4"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.2.4"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.2.4"}]}]}],"products":[{"vendor":"electron","product":"electron"},{"vendor":"electronjs","product":"electron"}],"references":[{"url":"https://github.com/electron/electron/security/advisories/GHSA-h9jc-284h-533g","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://www.electronjs.org/releases/stable?page=3#release-notes-for-v824","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory","web"]},{"url":"https://github.com/electron/electron/commit/b8e347709245d2dc5640fbb3044d9b21b4eaa6b0","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-4077","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-h9jc-284h-533g"}],"sources":{"cve":[{"id":"CVE-2020-4077","title":"Context isolation bypass via contextBridge in Electron","description":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.","status":"published","published":"2020-07-07T00:05:16Z","modified":"2024-08-04T07:52:20.939Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-501"],"updated_at":"2026-11-02T14:35:55.797746Z"}],"euvd":[{"id":"EUVD-2020-0558","description":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.","status":"published","published":"2020-07-07T00:05:16Z","modified":"2024-08-04T07:52:20Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T03:08:08.458165Z"}],"ghsa":[{"id":"GHSA-h9jc-284h-533g","title":"Context isolation bypass via contextBridge in Electron","description":"### Impact\nApps using both `contextIsolation` and `contextBridge` are affected.\n\nThis is a context isolation bypass, meaning that code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions.\n\n### Workarounds\nThere are no app-side workarounds, you must update your Electron version to be protected.\n\n### Fixed Versions\n* `9.0.0-beta.21`\n* `8.2.4`\n* `7.2.4`\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [security@electronjs.org](mailto:security@electronjs.org)","status":"published","published":"2020-07-07T00:01:10Z","modified":"2023-01-09T05:03:27Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-501"],"updated_at":"2026-11-02T14:36:05.071174Z"}],"nvd":[{"id":"CVE-2020-4077","description":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.","status":"published","published":"2020-07-07T00:15:10.7Z","modified":"2026-06-17T03:19:31.783Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-501"],"updated_at":"2026-11-02T14:06:08.145904Z"}],"osv":[{"id":"CVE-2020-4077","description":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.","status":"published","published":"2020-07-07T00:15:10.7Z","modified":"2026-10-20T10:53:28.341524017Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:16.936975Z"},{"id":"GHSA-h9jc-284h-533g","title":"Context isolation bypass via contextBridge in Electron","description":"### Impact\nApps using both `contextIsolation` and `contextBridge` are affected.\n\nThis is a context isolation bypass, meaning that code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions.\n\n### Workarounds\nThere are no app-side workarounds, you must update your Electron version to be protected.\n\n### Fixed Versions\n* `9.0.0-beta.21`\n* `8.2.4`\n* `7.2.4`\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [security@electronjs.org](mailto:security@electronjs.org)","status":"published","published":"2020-07-07T00:01:10Z","modified":"2026-07-08T06:29:45.073170767Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-501"],"updated_at":"2026-11-02T15:46:48.920784Z"}]}}