Mozilla Thunderbird is a standalone mail and newsgroup client.
Security Fix(es):
- thunderbird: JavaScript Execution via Spoofed PDF Attachment and file:/// Link (CVE-2025-3909)
- thunderbird: Sender Spoofing via Malformed From Header in Thunderbird (CVE-2025-3875)
- thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links (CVE-2025-3877)
- thunderbird: Tracking Links in Attachments Bypassed Remote Content Blocking (CVE-2025-3932)
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.