CVE-2025-3523

MediumCVSS 6.4/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.4/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

Weakness enumeration

CWE-451

Affected software

No affected versions have been published.

Timeline

Published: Apr 15, 2025
Last modified: Jun 17, 2026
NVD status: Modified

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