Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-08-18T12:23:34 firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component 3.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N CWE-807

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.

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the Data Loss Prevention component

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat Enterprise Linux 10 2026-08-24T00:00:00Z RHSA-2026:58899 firefox-0:140.14.0-1.el10_2 Red Hat Enterprise Linux 10.0 Extended Update Support 2026-09-08T00:00:00Z RHSA-2026:64813 firefox-0:140.14.0-1.el10_0 Red Hat Enterprise Linux 7 Extended Lifecycle Support 2026-09-08T00:00:00Z RHSA-2026:65442 firefox-0:140.14.0-1.el7_9 Red Hat Enterprise Linux 8 2026-08-24T00:00:00Z RHSA-2026:58898 firefox-0:140.14.0-1.el8_10 Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 2026-09-08T00:00:00Z RHSA-2026:65111 firefox-0:140.14.0-1.el8_4 Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 2026-09-08T00:00:00Z RHSA-2026:65111 firefox-0:140.14.0-1.el8_4 Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 2026-09-08T00:00:00Z RHSA-2026:65110 firefox-0:140.14.0-1.el8_6 Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 2026-09-08T00:00:00Z RHSA-2026:65110 firefox-0:140.14.0-1.el8_6 Red Hat Enterprise Linux 8.8 Telecommunications Update Service 2026-09-08T00:00:00Z RHSA-2026:64814 firefox-0:140.14.0-1.el8_8 Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 2026-09-08T00:00:00Z RHSA-2026:64814 firefox-0:140.14.0-1.el8_8 Red Hat Enterprise Linux 9 2026-08-24T00:00:00Z RHSA-2026:58897 firefox-0:140.14.0-1.el9_8 Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 2026-09-09T00:00:00Z RHSA-2026:65888 firefox-0:140.14.0-1.el9_2 Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 2026-09-08T00:00:00Z RHSA-2026:65105 firefox-0:140.14.0-1.el9_4 Red Hat Enterprise Linux 9.6 Extended Update Support 2026-09-08T00:00:00Z RHSA-2026:65103 firefox-0:140.14.0-1.el9_6 Red Hat Enterprise Linux 10 Under investigation rhel10/firefox-flatpak Red Hat Enterprise Linux 10 Under investigation rhel10/thunderbird-flatpak Red Hat Enterprise Linux 10 Under investigation thunderbird Red Hat Enterprise Linux 6 Out of support scope firefox Red Hat Enterprise Linux 6 Out of support scope thunderbird Red Hat Enterprise Linux 7 Out of support scope thunderbird Red Hat Enterprise Linux 8 Affected thunderbird Red Hat Enterprise Linux 9 Under investigation thunderbird https://www.cve.org/CVERecord?id=CVE-2026-74983 https://nvd.nist.gov/vuln/detail/CVE-2026-74983 https://www.mozilla.org/security/advisories/mfsa2026-76/#CVE-2026-74983 https://www.mozilla.org/security/advisories/mfsa2026-79/#CVE-2026-74983