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.

INFO

Published Date :

2025-04-15T15:06:14.164Z

Last Modified :

2026-04-13T14:28:31.335Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-3523 vulnerability.

Vendors Products
Mozilla
  • Thunderbird
Redhat
  • Enterprise Linux
  • Rhel Aus
  • Rhel E4s
  • Rhel Eus
  • Rhel Tus
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-3523.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1958385 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-3523 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-3523 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-26/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-27/ cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact