Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-3522

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 affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.4%
CVSS Severity
CVSS v3 Score 6.3
Products affected by CVE-2025-3522


Contact Us

Shodan ® - All rights reserved