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OpenAdvisories
High ALSA-2021:4130 6 CVEs

Important: thunderbird security update

Published Nov 4, 2021 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

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.

Fixed packages 2

ReleasePackageFixed in
AlmaLinux · 8 thunderbird 91.3.0-2.el8_4.alma
AlmaLinux · 8 thunderbird 91.3.0-2.el8_4.alma.plus

Vulnerabilities 6

References

  • report
    https://vulners.com/cve/CVE-2021-38503
  • report
    https://vulners.com/cve/CVE-2021-38504
  • report
    https://vulners.com/cve/CVE-2021-38506
  • report
    https://vulners.com/cve/CVE-2021-38507
  • report
    https://vulners.com/cve/CVE-2021-38508
  • report
    https://vulners.com/cve/CVE-2021-38509