CVE-2026-17953 Overview
CVE-2026-17953 is a policy enforcement weakness in the WebView component of Google Chrome on Android versions prior to 151.0.7922.72. A remote attacker can bypass navigation restrictions by delivering a crafted HTML page to an affected WebView instance. Chromium rates the security severity as Low, but the flaw still weakens a security boundary that Android applications rely on when embedding web content.
Critical Impact
A remote attacker can bypass WebView navigation restrictions through a crafted HTML page, undermining policy controls that host applications depend on to constrain embedded web content.
Affected Products
- Google Chrome on Android prior to 151.0.7922.72
- Android applications embedding the affected Chrome WebView component
- Chromium-based WebView implementations sharing the vulnerable navigation policy code
Discovery Timeline
- 2026-07-30 - CVE-2026-17953 published to the National Vulnerability Database
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-17953
Vulnerability Analysis
The vulnerability resides in the WebView subsystem of Google Chrome on Android. WebView enforces navigation policies that determine which URLs an embedded browser view is permitted to load. Insufficient enforcement of those policies allows navigations that should have been blocked.
An attacker who convinces a user to load attacker-controlled HTML can direct the WebView to navigate to destinations outside the intended policy scope. This can weaken sandboxing assumptions made by host Android applications, including those that use WebView to render restricted content. Chromium tracks the underlying issue publicly in the Chromium Issue Tracker Entry.
Root Cause
The root cause is incomplete policy enforcement inside the WebView navigation path. Navigation checks fail to fully validate certain transitions initiated by crafted HTML content, permitting the WebView to reach targets that the configured navigation policy was meant to forbid. Full technical detail is limited pending upstream disclosure through Chromium's staged bug visibility process.
Attack Vector
Exploitation requires a remote attacker to serve a crafted HTML page to an Android device running an affected Chrome or WebView build. No authentication is required. The attacker triggers navigation transitions from within the malicious page to reach resources outside the WebView's intended navigation scope. Interaction is limited to loading the attacker's page, which can occur through phishing links, malvertising, or compromised sites.
No verified proof-of-concept code is publicly available. The vulnerability is described in prose only in the vendor advisory referenced by the Google Chrome Update Announcement.
Detection Methods for CVE-2026-17953
Indicators of Compromise
- Android devices running Chrome or WebView versions earlier than 151.0.7922.72
- Unexpected navigations in WebView-hosted applications to origins outside declared allowlists
- HTTP request logs showing WebView user agents fetching resources inconsistent with the host application's expected navigation policy
Detection Strategies
- Inventory installed Chrome and Android System WebView versions across the mobile fleet and flag builds below 151.0.7922.72
- Review mobile application telemetry for anomalous navigation events originating from embedded WebViews
- Correlate proxy or DNS logs with known malicious HTML delivery infrastructure to identify targeted users
Monitoring Recommendations
- Track Chrome stable channel release notes for Android to confirm rollout of the fixed build
- Monitor mobile threat defense signals for crafted HTML payloads targeting WebView navigation logic
- Alert on Android applications that log navigation-policy violations or unexpected URL loads inside WebView
How to Mitigate CVE-2026-17953
Immediate Actions Required
- Update Google Chrome on Android to version 151.0.7922.72 or later through the Google Play Store
- Update Android System WebView to the corresponding fixed version on all managed devices
- Push mandatory updates through mobile device management (MDM) for enterprise-managed Android devices
Patch Information
Google addressed CVE-2026-17953 in Chrome for Android version 151.0.7922.72. Details are published in the Google Chrome Update Announcement. Applying the vendor update is the authoritative remediation.
Workarounds
- Restrict use of applications embedding WebView to content served from trusted origins until the update is deployed
- Enforce URL allowlists at the network layer for managed Android devices to limit exposure to crafted HTML pages
- Educate users to avoid opening untrusted links on Android devices until the fixed Chrome and WebView builds are installed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
