PT-2026-21736 · Mozilla · Thunderbird+1

Skywarp · Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2803

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148

Description An information disclosure issue exists, along with a mitigation bypass, within the Settings UI component.

Recommendations Update Firefox to version 148 or later. Update Thunderbird to version 148 or later.

Fix

Protection Mechanism Failure

Information Disclosure

Weakness Enumeration

CWE-693

CWE-200

Related Identifiers

BDU:2026-06188

CVE-2026-2803

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 74

• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/729332 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06188 · Security Note
• https://osv.dev/vulnerability/CVE-2026-2803 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0423SE18MD · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2803 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2803 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2026-0421SE17 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16/#CVE-2026-2803 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-2803 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2803 · Security Note