CVE-2020-15664
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.
Does this matter?
Lower severity and a low EPSS score (1.39%). Track it; it rarely justifies an emergency change on its own.
Description
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 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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- EPSS
- 1.39% probability · 72th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/firefox mobile · mozilla/thunderbird
- Source
- security@mozilla.org
EPSS 1.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1658214Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-36/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-37/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-38/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-39/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-40/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-41/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1658214Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-36/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-37/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-38/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-39/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-40/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-41/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.