CVE-2026-11272 Overview
CVE-2026-11272 is an input validation vulnerability in the Reading List component of Google Chrome on iOS prior to version 149.0.7827.53. The flaw stems from insufficient validation of untrusted input [CWE-20], allowing a remote attacker to perform privilege escalation through a crafted HTML page. Exploitation requires the victim to engage in specific user interface gestures, which lowers the practical exploitability but does not eliminate the risk. Google attributes a Chromium security severity of Low, though NVD assigns a higher CVSS score reflecting the impact on confidentiality, integrity, and availability if successfully exploited.
Critical Impact
A remote attacker can escalate privileges on iOS Chrome by luring a user to a malicious HTML page and tricking them into specific UI interactions.
Affected Products
- Google Chrome on iOS prior to 149.0.7827.53
- Apple iPhone OS (as the host platform for Chrome iOS)
- Chrome Reading List component
Discovery Timeline
- 2026-06-05 - CVE-2026-11272 published to NVD
- 2026-06-09 - Last updated in NVD database
Technical Details for CVE-2026-11272
Vulnerability Analysis
The vulnerability resides in the Reading List feature of Google Chrome for iOS. Reading List allows users to save web pages for later offline reading. The component fails to properly validate untrusted input supplied through a crafted HTML page. When a user performs specific UI gestures on attacker-controlled content, the unvalidated input is processed in a way that enables privilege escalation within the browser context.
The issue is categorized under [CWE-20] Improper Input Validation. The attack requires user interaction, reflected in the CVSS vector component UI:R. However, no authentication is required, and the attack can be delivered over the network through any web page the user visits.
Successful exploitation can result in elevated privileges within the Chrome iOS sandbox, potentially allowing the attacker to access resources or perform actions that should be restricted by the browser's security model.
Root Cause
The Reading List feature accepts and processes data from untrusted HTML content without enforcing sufficient validation checks. Attackers can craft HTML markup that, when interpreted by the Reading List handler during specific user gestures, triggers unintended privileged operations.
Attack Vector
An attacker hosts a crafted HTML page and lures a victim to visit it. The page is designed to invite or social-engineer the user into specific UI gestures, such as adding the page to the Reading List or interacting with a manipulated element. Once the gesture is performed, the malformed input bypasses validation and triggers privilege escalation within Chrome on iOS.
The vulnerability is exploited remotely with low attack complexity. No code example is published, and no public proof-of-concept is currently available. Refer to the Chromium Issue Tracker Entry for technical specifics once disclosure restrictions are lifted.
Detection Methods for CVE-2026-11272
Indicators of Compromise
- Chrome iOS installations reporting version strings earlier than 149.0.7827.53
- Unexpected entries appearing in the Reading List after visits to untrusted sites
- Outbound web traffic to recently registered domains hosting HTML with unusual Reading List integration markup
Detection Strategies
- Inventory iOS devices and identify Chrome versions below 149.0.7827.53 using mobile device management telemetry
- Monitor proxy and DNS logs for users visiting suspicious URLs immediately followed by anomalous Chrome behavior
- Correlate phishing or smishing campaigns that direct users to mobile-targeted HTML payloads
Monitoring Recommendations
- Enable mobile threat defense telemetry on managed iOS devices to surface browser-based anomalies
- Track Chrome update status across the iOS fleet and alert on devices that fail to reach the patched build
- Review user-reported phishing messages for links instructing recipients to add pages to Reading List
How to Mitigate CVE-2026-11272
Immediate Actions Required
- Update Google Chrome on iOS to version 149.0.7827.53 or later through the Apple App Store
- Enforce automatic app updates on managed iOS devices via mobile device management policies
- Communicate the risk to users and instruct them to avoid following untrusted links or performing UI gestures requested by unknown web pages
Patch Information
Google addressed the vulnerability in Chrome for iOS 149.0.7827.53. Details are available in the Google Chrome Update Announcement. Organizations managing iOS fleets should validate that App Store updates have been applied across all devices.
Workarounds
- Restrict use of Chrome on iOS until the patched version is deployed, defaulting users to a known-patched browser where feasible
- Apply web filtering at the network or DNS layer to block access to suspicious or newly registered domains
- Disable or discourage use of the Reading List feature on managed devices until updates are confirmed installed
# Verify Chrome iOS version via MDM query (example pseudocode)
mdm query --app com.google.chrome.ios --field CFBundleShortVersionString
# Expected output: 149.0.7827.53 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
