High severity7.5NVD Advisory· Published Jul 21, 2026· Updated Jul 22, 2026
CVE-2026-16405
CVE-2026-16405
Description
Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Affected products
20cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <153.0.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: >=140.1.0,<140.13.0
- (no CPE)range: >=153
- Range: >=153
- osv-coords16 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-docker-selenium-compatpkg:apk/chainguard/firefox-esrpkg:apk/chainguard/firefox-esr-140pkg:apk/wolfi/firefoxpkg:apk/wolfi/firefox-docker-selenium-compatpkg:rpm/almalinux/firefoxpkg:rpm/almalinux/firefox-x11pkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/mozilla-nspr&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/mozilla-nss&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/rust-cbindgen&distro=openSUSE%20Leap%2016.0
< 153.0-r0+ 15 more
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r1
- (no CPE)range: < 140.13.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 140.13.0-1.el10_2
- (no CPE)range: < 140.13.0-1.el9_8.alma.1
- (no CPE)range: < 140.13.0-1.el10_2.alma.1
- (no CPE)range: < 140.13.0-160000.1.1
- (no CPE)range: < 153.0-1.1
- (no CPE)range: < 140.13.0-1.1
- (no CPE)range: < 140.13.0-1.1
- (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
Patches
Vulnerability mechanics
References
5- www.mozilla.org/security/advisories/mfsa2026-68/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-70/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- www.mozilla.org/security/advisories/mfsa2026-71/nvd
- www.mozilla.org/security/advisories/mfsa2026-72/nvd
News mentions
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