CVE-2025-3859

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{"analysis": {"en": {"generated_at": "2026-04-20T17:10:40.606251+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Focus to version 138 or later to eliminate the URL truncation flaw.", "Avoid interacting with websites that employ excessively long URLs designed to truncate; verify the full address by hovering over or copying the link.", "Consider using an alternative mobile browser for sites where address bar integrity is critical."], "summary": {"action": "Immediate Update", "impact": "Address bar spoofing"}, "threat_synthesis": {"affected_systems": "The issue affects Mozilla Focus on iPhone OS, specifically all builds prior to version 138. Users running an earlier Focus release are susceptible to the URL truncation behavior.", "description_and_impact": "The flaw allows a website to craft a very long URL that, when loaded in Firefox Focus, is truncated in the location bar, potentially displaying a misleading shorter address. The truncation may cause a user to erroneously believe they are on a different site, thus facilitating phishing or social engineering attacks. The weakness is represented by CWE\u2011451 (Information Exposure) and CWE\u2011601 (Intentional Redirect), indicating that the vulnerability is a result of improper handling of user-visible data rather than a code execution flaw.", "risk_and_exploitability": "The CVSS score of 4.3 classifies the impact as low, and the EPSS score of less than 1% indicates a very low probability of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, and it is a client\u2011side UI bug that requires a user to visit a crafted long URL. Consequently, the overall risk is moderate in that it could support phishing attempts but does not enable remote code execution or system compromise."}}}}, "created": "2026-04-20T17:15:12.550906+00:00", "updated": "2026-04-20T17:15:12.550922+00:00", "vendors": []}