Vulnerability in Mozilla Thunderbird
CVE-2025-3932
It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thun…
EPSS: 0.003 (23.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Mozilla Thunderbird — versions 128.10.1, 138.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-3932?
- CVE-2025-3932 is a medium-severity vulnerability in Mozilla Thunderbird, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 6.5/10. Published 2025-05-14.
- How severe is CVE-2025-3932?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-3932 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.