{"id":"CVE-2026-109434","published":"2026-10-19T19:17:19.650","lastModified":"2026-10-19T21:14:14.150","description":"Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability that allows remote attackers to impersonate the browser's trusted address bar by entering fullscreen mode via the Fullscreen API without displaying a persistent notification or trusted-origin indicator. Attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content after a single user tap, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.","cvssScore":4.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwes":["CWE-451"],"vendors":[],"products":[],"references":[{"url":"https://www.fenrir-inc.com/jp/news/2026/10/15/sleipnir-mobile-for-android-3-9-0/","tags":[]},{"url":"https://www.vulncheck.com/advisories/sleipnir-browser-fullscreen-address-bar-spoofing","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}