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CVE-2025-3523
Published: Apr 15, 2025
Modified: Apr 13, 2026
PUBLISHED
Description
When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hovering over any attachment. Although the correct link is used on click, the misleading hover text could trick users into downloading content from untrusted sources. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
| Vendor | Product | Versions |
|---|---|---|
Mozilla | Thunderbird | unaffected 128.9.2 - <= 128.*unaffected 137.0.2 - <= * |
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