PT-2026-49693 · Mozilla · Firefox+1

Mihalis Haatainen · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-12324

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Firefox ESR versions prior to 140.12 Thunderbird versions prior to 152 Thunderbird versions prior to 140.12

Description Incorrect boundary conditions exist in the Graphics: CanvasWebGL component.

Fix

Weakness Enumeration

CWE-703

Related Identifiers

CVE-2026-12324

Affected Products

Firefox

Thunderbird

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-12324 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-58 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-61 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2038444 · Note
• https://twitter.com/VulmonFeeds/status/2066910315376267304 · Twitter Post