High severity7.5NVD Advisory· Published Jul 21, 2026· Updated Jul 24, 2026

CVE-2026-16399

Description

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Mozilla Corporation/Firefox2 versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <153.0.0
- (no CPE)range: >=153
Mozilla Corporation/Thunderbird2 versions
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <153.0
- (no CPE)range: >=153
osv-coords10 versions
pkg:apk/chainguard/firefox pkg:apk/chainguard/firefox-docker-selenium-compat pkg:apk/wolfi/firefox pkg:apk/wolfi/firefox-docker-selenium-compat pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/mozilla-nspr&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/mozilla-nss&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/rust-cbindgen&distro=openSUSE%20Leap%2016.0
< 153.0-r0+ 9 more
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.1.0-160000.1.2
- (no CPE)range: < 153.0-1.1
- (no CPE)range: < 153.0-1.1
- (no CPE)range: < 4.39-160000.1.1
- (no CPE)range: < 3.125-160000.1.1
- (no CPE)range: < 0.29.4+git0-160000.1.1