HIGH🇬🇧 English

CVE-2025-3909

CVSS 8.1v3.1pub. 2025-05-14upd. 2026-04-13

Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and setting its content type to application/pdf, Thunderbird may incorrectly render it as HTML when opened, allowing the embedded JavaScript to run without requiring a file download. This behavior relies on Thunderbird auto-saving the attachment to /tmp and linking to it via the file:/// protocol, potentially enabling JavaScript execution as part of the HTML. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

oryginał EN
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

  • Mozilla Thunderbird

    APP
    Mozilla
    < 128.10.1129.0 – 138.0.1 (bez)
🔵
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CWE
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