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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 affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Reserved 2025-04-11 | Published 2025-04-15 | Updated 2025-04-15 | Assigner mozillaUser Interface (UI) Misrepresentation of attachment URL
Dario Weißer
bugzilla.mozilla.org/show_bug.cgi?id=1958385
www.mozilla.org/security/advisories/mfsa2025-26/
www.mozilla.org/security/advisories/mfsa2025-27/
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