CVE-2025-3523

MEDIUM EPSS 17.7%
Published Apr 15, 20251y ago · Modified Jun 17, 20261w ago
6.4 CVSS 3.1
Medium
Find Similar
Published Apr 15, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
6.4
Exploitability
1.6
Impact
4.7
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity High
Availability Low

Threat Intelligence

EPSS Exploit Probability
17.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-451

Affected Products 2

VendorProductVersionRange
mozillathunderbird* <128.9.2
mozillathunderbird*≥129.0  –  <137.0.2

References 3

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1958385
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-26/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-27/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.