8.1
Élevée
CVE-2025-3909 Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the…
Description
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.
Produits et versions touchés
| Produit | Versions touchées | Corrigé en |
|---|---|---|
| Thunderbird 138.0 | premières → < 138.0.1 | 138.0.1 |
| Thunderbird 128.10 | premières → < 128.10.1 | 128.10.1 |
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