CVE-2026-17813 Overview
CVE-2026-17813 is an insufficient policy enforcement vulnerability in Google Chrome for iOS versions prior to 151.0.7922.72. The flaw allows a remote attacker to bypass navigation restrictions using a crafted HTML page. Chromium classifies the security severity as Medium.
The issue affects the Chrome for iOS navigation policy layer. An attacker hosting malicious content can direct a victim's browser to navigate to destinations that should be restricted by browser policy. This weakens web security boundaries enforced by Chrome on iOS devices.
Critical Impact
Remote attackers can bypass Chrome for iOS navigation restrictions through a crafted HTML page, undermining browser-enforced policy controls.
Affected Products
- Google Chrome for iOS versions prior to 151.0.7922.72
- iOS devices running vulnerable Chrome builds
- Enterprise deployments relying on Chrome for iOS navigation policies
Discovery Timeline
- 2026-07-30 - CVE-2026-17813 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-17813
Vulnerability Analysis
The vulnerability stems from insufficient policy enforcement in the navigation handling code of Chrome for iOS. Chrome enforces navigation restrictions to prevent pages from redirecting users to disallowed URLs, schemes, or contexts. This policy layer fails to validate certain navigation requests originating from crafted HTML content.
An attacker constructs a page containing markup or scripted navigation logic that circumvents the intended checks. When a user loads the page, the browser follows navigation instructions that should have been blocked. The result is a bypass of browser-enforced restrictions on iOS.
Details are tracked in the Chromium Issue Tracker #517184957. Google fixed the flaw in Chrome for iOS 151.0.7922.72, as noted in the Google Chrome Stable Update.
Root Cause
The root cause is missing or incomplete enforcement of navigation policy in Chrome for iOS. The browser accepts navigation transitions that should be validated against defined restrictions. This is a policy enforcement flaw rather than a memory-safety issue.
Attack Vector
Exploitation requires the victim to visit a crafted HTML page controlled by the attacker. No authentication is required. The attack is remote and delivered through standard web content, such as a malicious link or embedded frame.
No verified proof-of-concept code is publicly available. Refer to the vendor advisory for technical details.
Detection Methods for CVE-2026-17813
Indicators of Compromise
- Chrome for iOS clients reporting version strings below 151.0.7922.72 in mobile device management (MDM) inventories
- Unexpected navigation events to restricted URLs or schemes in browser telemetry
- HTML content hosting scripted redirects targeting policy-restricted destinations
Detection Strategies
- Inventory Chrome for iOS versions across managed devices and flag builds earlier than 151.0.7922.72
- Review web proxy and DNS logs for user navigation patterns inconsistent with configured browser policies
- Correlate mobile browser telemetry with threat intelligence on crafted HTML redirect campaigns
Monitoring Recommendations
- Track Chrome for iOS release notes and stable channel updates for version compliance
- Monitor MDM compliance reports for iOS devices out of date on Chrome
- Alert on outbound requests from iOS devices to known malicious hosts serving crafted HTML
How to Mitigate CVE-2026-17813
Immediate Actions Required
- Update Google Chrome for iOS to version 151.0.7922.72 or later on all managed devices
- Enforce Chrome update policies through MDM to ensure timely patching of iOS endpoints
- Communicate with users to install the latest Chrome build from the App Store
Patch Information
Google released the fix in Chrome for iOS 151.0.7922.72. Users should install the update through the Apple App Store. See the Google Chrome Stable Update for release details.
Workarounds
- Restrict access to untrusted web content on iOS devices until Chrome is updated
- Use alternative browsers with current security patches where feasible for high-risk users
- Apply network-level URL filtering to block known malicious pages targeting mobile browsers
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
