CVE-2026-3889

Description

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

Affected Platforms

Weakness Type

CWE-451

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/