| Description: | Mozilla Thunderbird is a standalone mail and newsgroup client.
This update upgrades Thunderbird to version 91.3.0.
Security Fix(es):
Mozilla: Use-after-free in HTTP2 Session object
Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3
Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)
Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)
Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning (CVE-2021-38506)
Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports (CVE-2021-38507)
Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing (CVE-2021-38508)
Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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