PT-2026-49680 · Mozilla · Firefox+1

Yaqoub Aldurayhim · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-12311

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

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

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 An information disclosure and sandbox escape issue exists within the Security: Process Sandboxing component. A sandbox escape occurs when a process bypasses the restricted environment designed to isolate it from the rest of the system.

Recommendations Update Firefox to version 152. Update Firefox ESR to version 140.12. Update Thunderbird to version 152. Update Thunderbird to version 140.12.

Fix

Information Disclosure

Weakness Enumeration

CWE-688

CWE-200

Related Identifiers

CVE-2026-12311

Affected Products

Firefox

Thunderbird

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-12311 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-61 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-58 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2040177 · Note