thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links

A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is...

CVE-2025-5986

A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is...

CVE-2025-5986

A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data e.g. using /dev/urandom on Linux or to...

CVE-2025-5986

The Mozilla Thunderbird email client is vulnerable to unsolicited file downloads , disk space exhaustion, and credential leakage due to insufficient validation of mailbox:/// links . A crafted HTML email can trigger automatic downloads of .pdf files to a user's desktop or home directory without p...

CVE-2025-3877

Rejected reason: This CVE was marked as fixed, but due to other code landing - was not actually fixed. It was subsequently fixed in CVE-2025-5986...

CVE-2025-3877

CVE-2025-3877 is rejected/not used; this entry does not represent an active vulnerability.