CVE-2025-3523

thunderbird: User Interface (UI) Misrepresentation of attachment URL

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Severity

Low

Red Hat Product Security

6.4

CVSS 3.1

Review impact separately from score.

Published · April 16, 2025

Updated · June 28, 2026

Description

A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: 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.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

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

CWE-451 · User Interface (UI) Misrepresentation of Critical Information