CERT-FR: Multiple Mozilla Firefox, Firefox ESR and Thunderbird vulnerabilities allow arbitrary code execution and data disclosure
CERT-FR advisory CERTFR-2026-AVI-1346 reports multiple vulnerabilities in Mozilla products (Firefox, Firefox ESR and Thunderbird), fixed in Mozilla security bulletins mfsa2026-111 to mfsa2026-115 of 20 October 2026. According to the advisory, some of the flaws allow an attacker to achieve arbitrary code execution, breach of data confident…