CVE-2025-3523 – Thunderbird External Attachment Link Disclosure Vulnerability

The following table lists the changes that have been made to the
CVE-2025-3523 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Apr. 15, 2025

    Action Type Old Value New Value
    Added 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 affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1958385
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-26/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-27/
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