CVE Catalog

CVE-2026-109434

MediumCVSS 4.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.30%

22th percentile - higher than 22% of all known CVEs

Summary

Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability allowing remote attackers to impersonate the trusted address bar by entering fullscreen mode via the Fullscreen API without a persistent notification or trusted-origin indicator. After a single user tap, attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content.

Risk Assessment

Users may be deceived by a fake address bar, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.

Recommendation

Update Fenrir Sleipnir Browser for Android to version 3.9.0 or later. Inform users about the risk of fake pages displayed in fullscreen mode.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS