The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element. This vulnerability affects Firefox < 56.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2018-06-11T21:00:00

Updated: 2024-08-05T16:12:28.355Z

Reserved: 2017-04-12T00:00:00

Link: CVE-2017-7820

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2018-06-11T21:29:10.873

Modified: 2019-10-03T00:03:26.223

Link: CVE-2017-7820

cve-icon Redhat

No data.