CVE-2026-17738 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Payments in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (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 payment handling system that could be exploited by remote attackers who have already compromised the renderer process. The issue stems from inadequate validation of untrusted input within the payments functionality, creating a pathway for privilege escalation attacks that bypass chrome's security boundaries. The vulnerability affects versions prior to 151.0.7922.72 and demonstrates how insufficient input validation can undermine fundamental security mechanisms designed to isolate browser components.
The technical flaw manifests in how chrome processes payment-related html content and user inputs within the renderer process. When a malicious actor successfully compromises this process through other means, they can craft specific html pages that exploit the inadequate validation logic to escape the sandbox environment. This represents a classic case of insufficient input sanitization where untrusted data flows directly into security-sensitive operations without proper verification or filtering mechanisms. The vulnerability's medium chromium security severity rating reflects the substantial risk it poses when combined with an existing compromised renderer process.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially enable full system compromise. An attacker who has already gained access to the renderer process can leverage this flaw to break out of chrome's isolated execution environment and gain access to underlying system resources. This type of attack vector aligns with tactics documented in the attack pattern taxonomy where adversaries seek to move laterally within compromised systems after initial access is achieved. The sandbox escape capability makes this particularly dangerous as it undermines the core security model that separates browser processes from the operating system.
This vulnerability maps directly to common weakness enumeration entry CWE-20 which describes "Improper Input Validation" and follows attack patterns associated with privilege escalation techniques in browser exploitation frameworks. The issue demonstrates how seemingly isolated functionality like payment processing can become a critical attack surface when proper input validation is omitted or insufficiently implemented. Organizations should prioritize immediate patching of affected chrome versions to mitigate this risk, while also implementing additional monitoring for suspicious renderer process activities that might indicate exploitation attempts.
Mitigation strategies should focus on maintaining current chrome versions through automated update mechanisms and implementing network-level controls to monitor for malicious html content delivery. Security teams should also consider deploying sandbox monitoring tools that can detect abnormal behavior patterns consistent with sandbox escape attempts. The vulnerability reinforces the importance of defense in depth approaches where multiple security layers protect against various attack vectors, particularly when dealing with complex browser environments where single points of failure can have significant operational consequences.