CVE Watchtower ← Back to CVE ListCVE-2026-74963NVDVulnerability SummarySame-origin policy bypass in the Networking: Cookies 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)0.12%ProbabilityRoot Weakness (CWE)N/AExternal Referenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=2050482https://www.mozilla.org/security/advisories/mfsa2026-74/https://www.mozilla.org/security/advisories/mfsa2026-76/https://www.mozilla.org/security/advisories/mfsa2026-77/