Mozilla Thunderbird is a standalone mail and newsgroup client.
Security Fix(es):
- firefox: thunderbird: Privilege escalation in Firefox Updater (CVE-2025-2817)
- firefox: thunderbird: Unsafe attribute access during XPath parsing (CVE-2025-4087)
- firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames (CVE-2025-4083)
- firefox: thunderbird: Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10 (CVE-2025-4091)
- firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10 (CVE-2025-4093)
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.