CVE-2026-3889

Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Score

CVSS 3.1 6.5 Medium

Status

Modified - security@mozilla.org

Published

2026-03-24

Last modified

2026-04-13

Weaknesses

CWE-451

Affected products

• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2020723
• https://www.mozilla.org/security/advisories/mfsa2026-23/
• https://www.mozilla.org/security/advisories/mfsa2026-24/