CVE-2026-109434 — Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing
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 f…
Published: 2026-10-19 · CVSS: 5.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7