CVE-2026-12302

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 mitigation bypass exists within the DOM security component. The Document Object Model (DOM) is a programming interface for web documents that represents the page so that programs can change the document structure, style, and content.

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.