CVE-2026-17888 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in WebUI in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via malicious network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape risk in Google Chrome's WebUI component that existed prior to version 151.0.7922.72. The flaw stems from inadequate validation of untrusted input within the browser's user interface framework, specifically affecting how Chrome processes network traffic destined for its internal WebUI components. The vulnerability is categorized under CWE-20 as a weakness in input validation, where the system fails to properly sanitize or validate data received from external sources before processing it within privileged contexts.
The technical exploitation of this vulnerability occurs when a remote attacker crafts malicious network traffic that targets Chrome's WebUI interface. This attack vector leverages the browser's trust model, where untrusted network data is processed without sufficient validation checks that would normally occur in user-facing interfaces. The flaw allows an attacker to potentially bypass Chrome's security sandbox mechanisms, which are designed to isolate untrusted web content from the browser's core processes and operating system resources. This represents a significant bypass of Chrome's security architecture as defined by the Chromium security model.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to potentially access sensitive system information, execute arbitrary code, or perform actions that should be restricted to trusted browser components. The medium severity classification reflects the complexity required for successful exploitation, which typically involves social engineering to deliver malicious traffic to a victim's system, combined with precise timing and targeting of the WebUI interface elements. This vulnerability affects all Chrome versions prior to 151.0.7922.72, making it particularly concerning given Chrome's widespread adoption across enterprise and consumer environments.
Mitigation strategies for this vulnerability require immediate patching of affected Chrome installations to version 151.0.7922.72 or later, which contains the necessary input validation improvements. Organizations should also implement network monitoring to detect suspicious traffic patterns that might indicate exploitation attempts, particularly targeting WebUI endpoints. The remediation aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage, as attackers may attempt to leverage this vulnerability to execute commands within the browser's privileged context. Additional defensive measures include implementing network segmentation, using web application firewalls to monitor traffic to Chrome's WebUI interfaces, and conducting regular security assessments of browser configurations to ensure proper sandbox enforcement.
The vulnerability demonstrates the ongoing challenges in securing complex browser architectures where multiple security layers must work together to prevent privilege escalation attacks. This flaw reinforces the importance of input validation across all interface components, particularly those that handle external data, as highlighted by the CWE-20 category's emphasis on preventing injection flaws. Organizations should maintain continuous monitoring for similar vulnerabilities in browser components and ensure their patch management processes can rapidly deploy security updates to protect against emerging threats targeting browser sandbox mechanisms.