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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 leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
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CVE Modified by Mozilla Corporation6/11/2025 9:15:24 AM
Action
Type
Old Value
New Value
Changed
Description
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 leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
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.
Removed
CVSS V3.1
CISA-ADP: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Removed
CWE
CISA-ADP: CWE-200
Removed
CPE Configuration
OR
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 128.10.1
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 129.0 up to (excluding) 138.0.1
Removed
Reference
Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580
Removed
Reference
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/
Removed
Reference
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/
Removed
Reference Type
Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Types: Permissions Required
Removed
Reference Type
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/ Types: Vendor Advisory
Removed
Reference Type
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/ Types: Vendor Advisory
CVE Rejected by Mozilla Corporation6/11/2025 9:15:24 AM
Action
Type
Old Value
New Value
Initial Analysis by NIST6/05/2025 10:26:54 AM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 128.10.1
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 129.0 up to (excluding) 138.0.1
Added
Reference Type
Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Types: Permissions Required
Added
Reference Type
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/ Types: Vendor Advisory
Added
Reference Type
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/ Types: Vendor Advisory
CVE Modified by CISA-ADP5/15/2025 1:15:55 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Removed
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVE Modified by CISA-ADP5/15/2025 11:16:09 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added
CWE
CWE-200
New CVE Received from Mozilla Corporation5/14/2025 1:15:48 PM
Action
Type
Old Value
New Value
Added
Description
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 leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
