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CVE-2026-109434— Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing

Quick assessment

Affected
Fenrir Sleipnir Mobile for Android
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fenrir Sleipnir 安卓浏览器 3.9.0 之前的版本存在 UI 欺骗漏洞。远程攻击者可利用全屏 API 进入全屏模式，且无需显示持久性通知或可信来源标识，从而伪造浏览器受信任的地址栏。攻击者只需用户单次点击，即可在由攻击者控制的内容上方渲染一个显示为可信来源的虚假地址栏，进而实施凭据窃取、恶意软件分发，或通过伪造登录、更新或支付页面进行社会工程攻击。

CVSS 4.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Fenrir Sleipnir Mobile for Android < 3.9.0 affected
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I. Basic Information for CVE-2026-109434

Vulnerability Information
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Vulnerability Title
Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键信息的UI错误表达
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Fenrir Sleipnir Mobile for Android 0 ~ 3.9.0 -

II. Public POCs for CVE-2026-109434

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109434

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Vendor Advisories for CVE-2026-109434 (1)

Vendor Pages for CVE-2026-109434 (1)

IV. Related Vulnerabilities

Same weakness: CWE-451

V. Comments for CVE-2026-109434

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