CVE-2026-17913 Overview
CVE-2026-17913 is a user interface spoofing vulnerability in Google Chrome for iOS. The flaw exists in versions prior to 151.0.7922.72 and stems from an inappropriate implementation in the browser. A remote attacker can exploit the issue by serving a crafted HTML page to a targeted user.
Chromium security engineers rated the severity as Low. The vulnerability does not enable code execution or memory corruption. Instead, it enables deception of the user by manipulating browser UI elements, which supports phishing and credential theft workflows.
Critical Impact
A remote attacker can spoof browser UI elements through a crafted HTML page, enabling phishing scenarios against Chrome for iOS users on unpatched builds.
Affected Products
- Google Chrome for iOS versions prior to 151.0.7922.72
- iOS devices running vulnerable Chrome builds
- Web sessions rendered within the affected Chrome for iOS application
Discovery Timeline
- 2026-07-30 - CVE-2026-17913 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-17913
Vulnerability Analysis
CVE-2026-17913 is classified as a User Interface Confusion issue in Chrome for iOS. The bug allows a malicious web page to manipulate what the user sees in trusted browser chrome. Attackers use this class of flaw to disguise the origin of content, forge address bar displays, or overlay legitimate UI elements.
The practical impact centers on social engineering. A convincing UI spoof can lead users to enter credentials, approve transactions, or download files under the assumption that they are interacting with a trusted site. Chromium rated the severity as Low because the vulnerability does not directly compromise system integrity or confidentiality.
Remediation shipped in Chrome for iOS 151.0.7922.72. Refer to the Chrome Stable Update Announcement and the Chromium Issue Tracker Entry for vendor detail.
Root Cause
The root cause is an inappropriate implementation within Chrome for iOS UI handling logic. The browser fails to enforce strict boundaries between web content rendering and trusted browser chrome under specific conditions triggered by attacker-controlled HTML.
Attack Vector
The attack vector is a crafted HTML page delivered to the victim through any standard web channel. Delivery mechanisms include phishing links, malicious advertisements, and compromised legitimate sites. The victim only needs to visit the page in a vulnerable Chrome for iOS build for the spoof to render.
No verified public proof-of-concept code is available for CVE-2026-17913. The Chromium Issue Tracker entry remains the authoritative technical reference.
Detection Methods for CVE-2026-17913
Indicators of Compromise
- User reports of suspicious Chrome for iOS address bar behavior, missing lock icons, or mismatched URLs on visited pages
- HTTP referrer or web proxy logs showing mobile Chrome user agents visiting newly registered or low-reputation domains hosting HTML content that renders unusual overlays
- Credential submission events on iOS devices that follow visits to unfamiliar external URLs
Detection Strategies
- Inventory Chrome for iOS versions across managed devices and flag any build below 151.0.7922.72
- Correlate mobile browser telemetry with phishing intelligence feeds to identify sessions terminating at credential-harvesting infrastructure
- Alert on iOS devices navigating to URLs flagged in threat intelligence as UI-spoof or phishing hosts
Monitoring Recommendations
- Track Chrome for iOS version distribution through mobile device management (MDM) reporting
- Forward mobile web proxy and DNS logs to a central analytics platform for correlation against phishing indicators
- Monitor authentication systems for anomalous logins that follow mobile browsing sessions to unknown domains
How to Mitigate CVE-2026-17913
Immediate Actions Required
- Update Chrome for iOS to version 151.0.7922.72 or later through the Apple App Store on all managed and personal devices
- Push MDM compliance policies requiring the patched Chrome build for corporate access
- Communicate the risk of UI spoofing to end users and reinforce verification of URLs before submitting credentials on mobile
Patch Information
Google addressed CVE-2026-17913 in Chrome for iOS 151.0.7922.72. Details are published in the Chrome Stable Update Announcement. The corresponding Chromium bug is tracked in the Chromium Issue Tracker Entry.
Workarounds
- Restrict browsing on iOS to trusted sites until the Chrome update is applied
- Route mobile web traffic through a secure web gateway that blocks known phishing and UI-spoof infrastructure
- Enforce phishing-resistant authentication such as FIDO2 or platform passkeys to reduce credential-theft impact from any successful spoof
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
