CVE-2026-15115 in Chrome
Summary
by MITRE • 07/09/2026
Insufficient validation of untrusted input in WebAppInstalls in Google Chrome on Android prior to 150.0.7871.115 allowed a local attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 07/09/2026
This vulnerability resides within the web application installation functionality of google chrome on android platforms and represents a critical security flaw that undermines fundamental web security principles. The issue stems from inadequate validation of untrusted input within the webappinstalls component which is responsible for handling web application installations and their associated permissions. When chrome processes crafted html pages containing malicious input, the insufficient validation allows attacker-controlled data to bypass normal security checks that should prevent unauthorized access to system resources.
The technical flaw manifests in how chrome handles user input during web application installation processes where the browser fails to properly sanitize or validate parameters passed to the webappinstalls module. This weakness creates a pathway for local attackers to craft specially designed html pages that exploit the validation gap, enabling them to circumvent the same origin policy that normally prevents web pages from accessing resources from different domains or origins. The same origin policy serves as a fundamental security mechanism in web browsers that isolates content from different sources to prevent cross-site scripting and data theft attacks.
The operational impact of this vulnerability extends beyond simple privilege escalation as it allows attackers to potentially access sensitive system resources through the compromised installation process. Attackers can leverage this flaw to bypass security boundaries that separate different application contexts, potentially enabling them to read or modify files, access user data, or perform other unauthorized actions within the browser environment. This represents a significant threat to user privacy and system integrity since it allows local code execution with elevated privileges that should normally be restricted.
The vulnerability aligns with several cybersecurity frameworks including CWE-20 which covers "Improper Input Validation" and relates to ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript" where attackers exploit browser-based scripting vulnerabilities. The high chromium security severity rating reflects the potential for remote code execution and privilege escalation that this flaw enables, making it particularly dangerous in mobile environments where users may be less aware of security risks. Organizations should prioritize immediate patching of affected chrome versions to prevent exploitation attempts.
Mitigation strategies include implementing the latest chrome updates which contain patches specifically addressing the input validation issues within webappinstalls functionality. System administrators should also deploy network monitoring solutions to detect suspicious html content and implement web application firewalls that can identify and block malicious installation requests. Additionally, user education regarding the dangers of visiting untrusted websites and downloading unknown applications remains crucial since this vulnerability requires user interaction through crafted web pages. The fix typically involves strengthening input validation mechanisms within chrome's installation processing pipeline and ensuring proper sanitization of all user-provided data before it is processed by system components that handle web application installations.