Mozilla releases security updates for Firefox 95, Firefox ESR 91.4.0, and Thunderbird 91.4.0

Hello everyone,

Mozilla has fixed several high severity security vulnerabilities in Firefox 95, Firefox ESR 91.4.0, and Thunderbird 91.4.0. The details of the vulnerabilities fixed are as follows:

Platform	CVE ID	Vulnerability	Impact
Thunderbird 91.4.0	CVE-2021-43528	JavaScript unexpectedly enabled for the composition area	Low
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43536	URL leakage when navigating while executing asynchronous function	High
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43537	Heap buffer overflow when using structured clone	High
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43538	Missing fullscreen and pointer lock notification when requesting both	High
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43539	GC rooting failure when calling wasm instance methods	High
Firefox 95	CVE-2021-43540	WebExtensions could have installed persistent ServiceWorkers	Moderate
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43541	External protocol handler parameters were unescaped	Moderate
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43542	XMLHttpRequest error codes could have leaked the existence of an external protocol handler	Moderate
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43543	Bypass of CSP sandbox directive when embedding	Moderate
Firefox 95	CVE-2021-43544	Universal XSS in Firefox for Android via QR Code URLs	High
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43545	Denial of Service when using the Location API in a loop	Low
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	CVE-2021-43546	Cursor spoofing could overlay user interface when native cursor is zoomed	Low
Firefox 95, Firefox ESR 91.4.0, Thunderbird 91.4.0	MOZ-2021-0009	Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4, Thunderbird 91.4.0	High
Firefox 95	MOZ-2021-0010	Use-after-free in fullscreen objects on MacOS	High

To patch these vulnerabilities, initiate a sync between the Central Patch Repository and the Desktop Central server. Once synced, search for the following Patch IDs or Bulletin IDs and deploy them to your target systems.

Patch ID	Bulletin ID	Patch Description
322722	TU-027	Mozilla Firefox (95.0)
322723	TU-027	Mozilla Firefox (x64) (95.0)
322724	TU-054	Mozilla Firefox ESR (91) (91.4.0)
322727	TU-054	Mozilla Firefox ESR (91) (x64) (91.4.0)
322726	TU-028	Mozilla Thunderbird (91) (x64) (91.4.0)
322725	TU-028	Mozilla Thunderbird (91) (91.4.0)