Multiple interpretations of UI input in Mozilla Thunderbird - CVE-2026-3889
Published: March 25, 2026
Vulnerability identifier: #VU124596
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-3889
CWE-ID: CWE-450
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Thunderbird
Mozilla Thunderbird
Detailed vulnerability description
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to improper implementation of UI. A remote attacker can send a specially crafted email to the victim and perform spoofing attack.
How to mitigate CVE-2026-3889
Install updates from vendor's website.