High severity8.1NVD Advisory· Published Aug 18, 2026· Updated Aug 19, 2026
CVE-2026-74983
CVE-2026-74983
Description
Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
10- osv-coords9 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0pkg:rpm/almalinux/firefox-x11pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/almalinux/firefoxpkg:rpm/opensuse/MozillaThunderbird&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%2016.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
< 140.14.0-160000.1.1+ 8 more
- (no CPE)range: < 140.14.0-160000.1.1
- (no CPE)range: < 140.14.0-1.el9_8.alma.1
- (no CPE)range: < 153.1.0-1.1
- (no CPE)range: < 140.14.0-1.el9_8.alma.1
- (no CPE)range: < 140.14.0-1.1
- (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
- (no CPE)range: < 154.0-1.1
- Range: >=154
Patches
Vulnerability mechanics
References
7- www.mozilla.org/security/advisories/mfsa2026-74/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-76/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-77/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-78/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-79/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-80/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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