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.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade thunderbirdUpgrade firefoxUpgrade linux-seamonkeyUpgrade linux-thunderbirdUpgrade libxulUpgrade seamonkeyUpgrade linux-firefoxUpgrade firefox-esr | Sep 29, 2017 | Sep 29, 2017 |
| Mfsa2017 21 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 56.0 | Jul 12, 2018 | Jun 11, 2018 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefoxUpgrade MozillaFirefox-translations-common | May 20, 2018 | Sep 28, 2017 |
| Ubuntu | — | Upgrade firefox | Oct 3, 2017 | Sep 28, 2017 |
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