#VU109193 Information disclosure in Mozilla Thunderbird - CVE-2025-3932

Vulnerability identifier: #VU109193

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-3932

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to incorrect handling of tracking links. A remote attacker can create a specially crafted email message that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 128.0, 128.0.1, 128.1.0, 128.1.1 - 135.0.1, 128.2.0, 128.2.1, 128.2.2, 128.2.3, 128.3.0, 128.3.1, 128.3.2, 128.3.3, 128.4.0, 128.4.1, 128.4.2, 128.4.3, 128.4.4, 128.5.0, 128.5.1, 128.5.2, 128.6.0, 128.6.1, 128.7.0, 128.7.1, 128.8.0, 128.8.1, 128.9.0, 128.9.1, 128.9.2, 128.10, 130.0, 132.0, 132.0.1, 133.0, 134.0, 135.0, 136.0, 136.0.1, 137.0, 137.0.1, 137.0.2, 138.0

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2025-34/
https://bugzilla.mozilla.org/show_bug.cgi?id=1960412
https://www.mozilla.org/en-US/security/advisories/mfsa2025-35/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.