{"id":"CVE-2020-15664","title":"By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension","summary":"By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user con…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cwe":["CWE-863"],"vendor":"mozilla","product":"firefox","affected":["firefox < 80.0","firefox >= 78.0, < 78.2","firefox_esr < 68.12","firefox_mobile < 80.0","thunderbird < 68.12","thunderbird >= 78.0, < 78.2"],"patched":["firefox 78.2","firefox_esr 68.12","firefox_mobile 80.0","thunderbird 78.2"],"published":"2020-10-01","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-15664","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1658214","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-36/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-37/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-38/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-39/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-40/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-41/","label":"security@mozilla.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1658214","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-36/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-37/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-38/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-39/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-40/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-41/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.01378,"epssPercentile":0.70461,"ingestedAt":"2026-08-19T16:41:54.455Z","slug":"CVE-2020-15664","body":"## Overview\n\nBy holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, Firefox ESR < 78.2, and Firefox for Android < 80.\n\n## Affected\n\n- `firefox < 80.0`\n- `firefox >= 78.0, < 78.2`\n- `firefox_esr < 68.12`\n- `firefox_mobile < 80.0`\n- `thunderbird < 68.12`\n- `thunderbird >= 78.0, < 78.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 78.2`\n- `firefox_esr 68.12`\n- `firefox_mobile 80.0`\n- `thunderbird 78.2`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}