Improper access control in Mozilla products - CVE-2026-12295

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Main Vulnerability Database Vulnerabilities #VU134608

Improper access control in Mozilla products - CVE-2026-12295

Published: June 16, 2026


Vulnerability identifier: #VU134608
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12295
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to escape the sandbox.

The vulnerability exists due to improper access control in the DOM: Navigation component when processing navigation operations. A remote attacker can trigger the vulnerable component to escape the sandbox.


Affected software

Mozilla Firefox
Firefox ESR
Firefox for Android
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 15
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems
Desktop Applications Module
SUSE Package Hub 15
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox-esr (Debian package)
thunderbird-librnp-rnp
firefox-debugsource
firefox-debuginfo
firefox
thunderbird-wayland
thunderbird-debugsource
thunderbird-debuginfo
thunderbird
firefox (Red Hat package)
thunderbird (Red Hat package)
MozillaFirefox-devel
MozillaFirefox-translations-common
MozillaFirefox-debugsource
MozillaFirefox
MozillaFirefox-debuginfo
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird-translations-other
MozillaThunderbird
MozillaThunderbird-translations-common
MozillaFirefox-translations-other
Mozilla Thunderbird

How to mitigate CVE-2026-12295

Install security update from vendor's website.

Mozilla Firefox - update to 152.0
Firefox for Android - update to 152.0
Firefox ESR - addressed in versions 115.37.0, 140.12.0
Mozilla Thunderbird - addressed in versions 140.12.0, 152.0
firefox-esr (Debian package) - update to 140.12.0esr-1~deb13u1
thunderbird-librnp-rnp - update to 140.12.0-1
firefox-debugsource - update to 140.12.0-1
firefox-debuginfo - update to 140.12.0-1
firefox - update to 140.12.0-1
thunderbird-wayland - update to 140.12.0-1
thunderbird-debugsource - update to 140.12.0-1
thunderbird-debuginfo - update to 140.12.0-1
thunderbird - update to 140.12.0-1
firefox - addressed in versions 140.12.0-1, 140.12.0-1.0.1
firefox (Red Hat package) - addressed in versions 140.12.0-1.el7_9, 140.12.0-1.el8_4, 140.12.0-1.el8_6, 140.12.0-1.el8_8, 140.12.0-1.el9_2, 140.12.0-1.el9_4, 140.12.0-1.el9_6, 140.12.0-1.el10_0
thunderbird (Red Hat package) - addressed in versions 140.12.0-1.el8_4, 140.12.0-1.el8_6, 140.12.0-1.el8_8, 140.12.0-1.el8_10, 140.12.0-1.el9_2, 140.12.0-1.el9_4, 140.12.0-1.el10_0, 140.12.0-1.el10_2
thunderbird - update to 140.12.0-1.0.1
MozillaFirefox-devel - addressed in versions 140.12.0-112.321.1, 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1
MozillaFirefox-translations-common - addressed in versions 140.12.0-112.321.1, 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1
MozillaFirefox-debugsource - addressed in versions 140.12.0-112.321.1, 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1
MozillaFirefox - addressed in versions 140.12.0-112.321.1, 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1
MozillaFirefox-debuginfo - addressed in versions 140.12.0-112.321.1, 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1
MozillaThunderbird-debugsource - update to 140.12.0-150200.8.277.1
MozillaThunderbird-debuginfo - update to 140.12.0-150200.8.277.1
MozillaThunderbird-translations-other - update to 140.12.0-150200.8.277.1
MozillaThunderbird - update to 140.12.0-150200.8.277.1
MozillaThunderbird-translations-common - update to 140.12.0-150200.8.277.1
MozillaFirefox-translations-other - addressed in versions 140.12.0-150200.152.242.1, 140.12.0-150200.152.245.1

External References

Related Security Bulletins