🔐 CVE Alert

CVE-2025-3523

MEDIUM 6.4

User Interface (UI) Misrepresentation of attachment URL

CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th

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 mozilla
Product thunderbird
Ecosystems
Industries
Technology
Published Apr 15, 2025
Last Updated Apr 13, 2026
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Affected Versions

Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1958385 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-26/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-27/

Credits

Dario Weißer