{"id":"CVE-2026-109759","title":"Site isolation issue in the Networking component","summary":"Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"none","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:40.063","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109759","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070252","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"security@mozilla.org"}],"tags":["nvd"],"ingestedAt":"2026-10-13T13:27:04.010Z","slug":"CVE-2026-109759","body":"## Overview\n\nSite isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}