CVE-2017-7820
MEDIUMFirefox < 56 - Xray Wrapper Bypass via instanceof Operator
Title source: llmDescription
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.
References (4)
Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry
x_refsource_sectrack
http://www.securitytracker.com/id/1039465
Exploit, Issue Tracking x_refsource_confirm
https://bugzilla.mozilla.org/show_bug.cgi?id=1378207
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2017-21/
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/101057
Scores
CVSS v3
5.3
EPSS
0.0081
EPSS Percentile
74.4%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Details
Status
published
Products (1)
mozilla/firefox
< 55.0.3
Published
Jun 11, 2018
Tracked Since
Feb 18, 2026