PT-2026-27515 · Mozilla · Thunderbird

Eemeli Aro · Published 2026-03-24 · Updated 2026-04-17 · CVE-2026-3889

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Thunderbird versions prior to 140.9 Thunderbird versions prior to 149

Description A spoofing issue exists in Thunderbird.

Recommendations Update Thunderbird to version 140.9 or later. Update Thunderbird to version 149 or later.

Fix

UI Misrepresentation of Critical Information

Weakness Enumeration

CWE-451

Related Identifiers

ALSA-2026:6188

ALSA-2026:6342

ALSA-2026:6917

CVE-2026-3889

MGASA-2026-0081

OESA-2026-1993

OESA-2026-1994

OPENSUSE-SU-2026:10447-1

RHSA-2026:6188

RHSA-2026:6342

RHSA-2026:6917

RHSA-2026:8284

RHSA-2026:8285

RHSA-2026:8286

RHSA-2026:8287

RHSA-2026:8288

RHSA-2026:8289

RHSA-2026:8290

RHSA-2026:8315

RHSA-2026:8850

SUSE-SU-2026:1163-1

Affected Products

Thunderbird

References · 193

• https://nvd.nist.gov/vuln/detail/CVE-2026-4689 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4718 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4691 · Security Note
• https://errata.almalinux.org/8/ALSA-2026-6917.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4687 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:6917 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4719 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-3889 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1994 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4711 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4721 · Security Note
• https://linux.oracle.com/errata/ELSA-2026-6917.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4700 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4684 · Security Note
• https://osv.dev/vulnerability/OESA-2026-1993 · Vendor Advisory