CVE-2025-13019 is a same-origin policy bypass vulnerability in the DOM Workers component affecting Firefox versions prior to 145 and Firefox ESR versions prior to 140.5. This vulnerability allows bypassing the same-origin policy, potentially enabling unauthorized access to web content from different origins. The issue is rated with moderate impact in the vendor advisory but has a high CVSS score of 8.1. Mozilla has fixed this vulnerability in Firefox 145 and Firefox ESR 140.5.