CVE-2026-11263 in Chrome
Summary
by MITRE • 06/05/2026
Insufficient policy enforcement in WebAuthentication in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a critical weakness in Google Chrome's WebAuthentication implementation on Android platforms, specifically affecting versions prior to 149.0.7827.53. The flaw stems from insufficient policy enforcement mechanisms that fail to properly validate cross-origin data access requests, creating a pathway for remote attackers to exploit compromised renderer processes. The vulnerability operates under the chromium security severity classification of low, yet its potential impact on data confidentiality and cross-origin isolation remains significant within modern web security frameworks.
The technical nature of this vulnerability resides in the improper enforcement of WebAuthentication policies within Chrome's Android implementation, where the renderer process can be compromised and subsequently used as a vector for cross-origin data leakage. When an attacker successfully compromises a renderer process, they can leverage this vulnerability to access data from different origins that should normally be isolated. This breach occurs through a crafted HTML page that exploits the weak policy enforcement, allowing unauthorized data exfiltration across origin boundaries. The flaw essentially undermines the fundamental security principle of cross-origin resource isolation that web browsers implement to prevent unauthorized data access.
From an operational perspective, this vulnerability poses significant risks to users of affected Chrome versions on Android devices. The attack scenario requires an initial compromise of the renderer process, which could occur through various attack vectors including phishing, malicious advertisements, or exploitation of other browser vulnerabilities. Once compromised, the renderer process becomes a conduit for unauthorized cross-origin data access, potentially exposing sensitive information from multiple websites or applications that the user has visited. The low security severity classification does not diminish the practical impact, as cross-origin data leakage can lead to privacy violations, credential theft, and potential escalation to more serious attacks.
The vulnerability aligns with CWE-693, which addresses protection mechanism failures in web applications, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for browser-based attacks. Organizations should implement immediate mitigation strategies including mandatory Chrome updates to version 149.0.7827.53 or later, along with enhanced monitoring for suspicious renderer process behavior. Additionally, administrators should consider implementing network-level controls to detect unusual cross-origin data access patterns and maintain updated threat intelligence feeds to identify potential exploitation attempts. Regular security audits of web applications and browser configurations remain essential to prevent exploitation of such policy enforcement weaknesses that could compromise user data confidentiality and system integrity.