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Critical severity9.8NVD Advisory· Published Sep 1, 2026· Updated Sep 3, 2026

CVE-2026-84134

CVE-2026-84134

Description

Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

10

Mozilla Corporation/Firefoxllm-fuzzy
Range: >=155
Mozilla Corporation/Thunderbirdllm-fuzzy
Range: >=155
osv-coords8 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/MozillaThunderbird&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 155.0.1-r0+ 7 more
- (no CPE)range: < 155.0.1-r0
- (no CPE)range: < 155.0.1-r0
- (no CPE)range: < 155.0.1-r0
- (no CPE)range: < 155.0.1-r0
- (no CPE)range: < 153.2.0-160000.1.1
- (no CPE)range: < 155.0-1.1
- (no CPE)range: < 153.4.0-1.1
- (no CPE)range: < 153.2.0-1.1

Patches

Vulnerability mechanics

References

5

www.mozilla.org/security/advisories/mfsa2026-82/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-85/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-86/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-88/nvdVendor Advisory
bugzilla.mozilla.org/show_bug.cginvdPermissions Required

News mentions

1

Mozilla Firefox & Thunderbird: 25 Vulnerabilities Including Critical Sandbox Escapes Disclosed Together
Vypr Intelligence · Sep 1, 2026