CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 6.3. It affects Windows, Chrome.
CVE
CVE-2025-3522
Severity
MEDIUM
CVSS
6.3
EPSS
0.26%
Windows Chrome
Original NVD Description
Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
Related CVEs
Other vulnerabilities affecting the same vendor(s)