PT-2026-49666 · Mozilla · Firefox+1

Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-12297

Positive Technologies (AI Summary)

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Firefox ESR versions prior to 140.12 Firefox ESR versions prior to 115.37 Thunderbird versions prior to 152 Thunderbird versions prior to 140.12

Description A sandbox escape exists due to incorrect boundary conditions within the Networking component. A sandbox is a security mechanism used to separate running programs from the rest of the system to prevent malicious code from accessing sensitive data or resources.

Recommendations Update Firefox to version 152. Update Firefox ESR to version 140.12. Update Firefox ESR to version 115.37. Update Thunderbird to version 152. Update Thunderbird to version 140.12.

Related Identifiers

CVE-2026-12297

Affected Products

Firefox

Thunderbird

References · 7

• https://mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-57 · 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/mfsa2026-59 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12297 · Security Note
• https://bugzilla.mozilla.org/show_bug.cgi?id=2041610 · Note