CVE-2026-13983: Chrome for iOS XSS Vulnerability

CVE-2026-13983 Overview

CVE-2026-13983 is an Omnibox (URL bar) spoofing vulnerability in Google Chrome for iOS versions prior to 150.0.7871.47. The flaw stems from an inappropriate implementation in the Chrome for iOS browser that allows a remote attacker to spoof the contents of the address bar. Exploitation requires the attacker to convince a user to perform specific user interface gestures while visiting a crafted HTML page. The Chromium project classifies the security severity as Medium. This class of issue is tracked under CWE-451: User Interface Misrepresentation of Critical Information.

Critical Impact
A successful attack lets a remote adversary display a misleading URL in the Omnibox, enabling convincing phishing pages that appear to originate from a trusted domain.

Affected Products

Google Chrome for iOS versions prior to 150.0.7871.47
iOS devices running vulnerable Chrome builds
Users interacting with attacker-crafted HTML pages in Chrome for iOS

Discovery Timeline

2026-06-30 - CVE-2026-13983 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-13983

Vulnerability Analysis

The vulnerability is a UI spoofing issue in Chrome for iOS. When a user performs specific gestures on a crafted HTML page, the browser fails to correctly synchronize the Omnibox display with the actual origin of the rendered content. The result is that the address bar can present a URL that does not match the underlying document. Because the Omnibox is the primary trust anchor iOS users rely on to verify a site's identity, an inconsistent display undermines phishing defenses and TLS trust indicators. The attack requires network access, user interaction, and a high level of attack complexity to reliably trigger the specific gesture and timing sequence.

Root Cause

The root cause is an inappropriate implementation in the navigation and Omnibox state handling within Chrome for iOS. The browser updates the visible URL based on assumed navigation state rather than the confirmed loaded document, creating a window during specific UI interactions where the displayed URL diverges from the actual content origin. This falls under CWE-451, covering misrepresentation of security-critical information in the user interface.

Attack Vector

An attacker hosts a crafted HTML page and lures a target to visit it in Chrome for iOS. The page uses scripted navigation, timing, or content manipulation that triggers during a specific user gesture such as a swipe, tap sequence, or navigation gesture. When the gesture executes, the Omnibox displays a URL of the attacker's choosing while the rendered content remains attacker-controlled. The attacker then presents a spoofed login page, fake banking interface, or fraudulent security prompt that appears to originate from a legitimate domain. See the Chromium Issue Tracker Entry and Google Chrome Stable Update for release details.

No verified proof-of-concept code is publicly available. The vulnerability manifests through a combination of scripted navigation and a specific UI gesture rather than through a memory corruption primitive.

Detection Methods for CVE-2026-13983

Indicators of Compromise

Chrome for iOS clients reporting installed versions earlier than 150.0.7871.47 in mobile device management inventories.
User reports of credential phishing pages that appear under trusted domain names in the Chrome iOS Omnibox.
Web proxy or DNS logs showing traffic to lookalike domains hosting crafted HTML that triggers navigation events immediately before form submission.

Detection Strategies

Inventory managed iOS devices and flag Chrome installations below 150.0.7871.47 for prioritized update.
Correlate outbound HTTP requests to newly registered or low-reputation domains with subsequent credential submissions from iOS user agents.
Monitor identity provider logs for authentication attempts from iOS Chrome sessions immediately following visits to untrusted external links.

Monitoring Recommendations

Enable phishing and malicious URL feeds in web gateways and mobile threat defense tooling to block delivery of crafted pages before they reach Chrome for iOS.
Track Chrome for iOS version telemetry through MDM compliance policies and alert on devices that remain unpatched beyond a defined SLA.
Review user-reported phishing submissions for URL bar screenshots that show discrepancies between the displayed origin and reported site behavior.

How to Mitigate CVE-2026-13983

Immediate Actions Required

Update Google Chrome for iOS to version 150.0.7871.47 or later through the Apple App Store on all managed and unmanaged devices.
Push an MDM compliance rule requiring the fixed Chrome version and restrict access to sensitive corporate resources from devices running earlier builds.
Reinforce user awareness that URL bar contents on mobile browsers can be manipulated and that credentials should be entered only after independent verification of the site.

Patch Information

Google addressed CVE-2026-13983 in Chrome for iOS 150.0.7871.47. Refer to the Google Chrome Stable Update release notes and the Chromium Issue Tracker Entry for change details. Deploy the update through the App Store or MDM-managed app catalog on all iOS endpoints.

Workarounds

Instruct users to avoid following links from untrusted messages or emails in Chrome for iOS until the update is applied.
Direct users to an alternate iOS browser for sensitive workflows such as banking or identity provider logins if the Chrome update cannot be applied immediately.
Use enterprise phishing protection and DNS filtering to block known malicious domains that host crafted spoofing pages.

bash

# Example MDM compliance check enforcing minimum Chrome for iOS version
# Pseudocode for a device compliance policy
require app.bundleId == "com.google.chrome.ios" \
  and app.version >= "150.0.7871.47" \
  else action = "block_corporate_access"