PT-2026-49672 · Mozilla · Thunderbird+1

Michal Andryskowski · CVE-2026-12303 · Published 2026-06-16 · Updated 2026-07-25

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Thunderbird versions prior to 152

Description Information disclosure occurs in the Graphics: WebGPU component due to incorrect boundary conditions.

Recommendations Update Firefox to version 152. Update Thunderbird to version 152.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-12303

OPENSUSE-SU-2026:11052-1

OPENSUSE-SU-2026:11373-1

Affected Products

Firefox

Thunderbird

References · 270

• https://osv.dev/vulnerability/openSUSE-SU-2026:11373-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-12303 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11052-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-12303 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-57 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-12303 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12303 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-12303 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-60 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-57/#CVE-2026-12303 · Vendor Advisory
• https://suse.com/security/cve/CVE-2025-9187 · Note
• https://suse.com/security/cve/CVE-2026-8969 · Note
• https://suse.com/security/cve/CVE-2026-0881 · Note