CVE-2025-3523 — User Interface (UI) Misrepresentation of attachment URL
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. …
Published: 2025-04-15 · CVSS: 6.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7