CVE-2025-3523

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CVSS 3.1

6.4 medium

EPSS

<1%p23

Published

Apr 15, 2025 (Apr 15, 2025)

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.

Vendors: mozilla
Products: thunderbird
Weakness: CWE-451
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

NVD CVE.org GitHub PoCs EPSS (0.3%)

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