#VU107463 Information disclosure in Mozilla Thunderbird - CVE-2025-3522
Published: April 15, 2025
Vulnerability identifier: #VU107463
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-3522
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Thunderbird
Mozilla Thunderbird
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a missing URL validation when processing the X-Mozilla-External-Attachment-URL header to handle externally hosted attachments. A remote attacker can send a specially crafted email to the victim that contains a link with an internally referenced document, such as "chrome://" or "chrome://" and force Thunderbird to share hashed Windows credentials with that URL, leading to information disclosure.
Remediation
Install updates from vendor's website.