CVE Watchtower ← Back to CVE ListCVE-2026-74960NVDVulnerability SummarySite isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.Severity LevelUNKNOWNPublished DateAug 18, 2026Last ModifiedAug 18, 2026Exploitation StatusNo confirmed exploitation yetEPSS Score (30-Day)0.16%ProbabilityRoot Weakness (CWE)N/AExternal Referenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=2049148https://www.mozilla.org/security/advisories/mfsa2026-74/https://www.mozilla.org/security/advisories/mfsa2026-76/https://www.mozilla.org/security/advisories/mfsa2026-77/