{"id":"CVE-2020-4077","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-4077","generatedAt":"2026-10-28T05:26:21.836Z","title":"In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass.","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.","published":"2020-07-07T00:15:11.000Z","lastModified":"2026-06-17T03:19:32.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-501"],"affected":["electronjs/electron"],"epss":{"score":0.01003,"percentile":0.62771,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.00%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/electron/electron/security/advisories/GHSA-h9jc-284h-533g","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://www.electronjs.org/releases/stable?page=3#release-notes-for-v824","tags":["Release Notes","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/electron/electron/security/advisories/GHSA-h9jc-284h-533g","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.electronjs.org/releases/stable?page=3#release-notes-for-v824","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-4077","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}