CVE-2025-3523 — User Interface (UI) Misrepresentation of Critical Information in Mozilla Thunderbird
Severity
6.4MEDIUMNVD
EPSS
0.2%
top 52.26%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedApr 15
Latest updateJul 22
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:LExploitability: 1.6 | Impact: 4.7
Affected Packages2 packages
🔴Vulnerability Details
2OSV▶
CVE-2025-3523: When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hov↗2025-04-15
GHSA▶
GHSA-4h7q-pj8m-5675: When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hov↗2025-04-15
📋Vendor Advisories
4Debian▶
CVE-2025-3523: thunderbird - When an email contains multiple attachments with external links via the X-Mozill...↗2025