CVE-2026-17681 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Web Authentication in Google Chrome on Android 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: High)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape flaw in Google Chrome's Web Authentication implementation on Android platforms, where insufficient input validation creates a pathway for remote attackers to bypass system security boundaries. The issue stems from the browser's failure to properly validate untrusted input within its Web Authentication API, which is designed to enable secure authentication using public key cryptography. When an attacker gains control of the renderer process through prior compromise, they can leverage this vulnerability to execute malicious code that escapes the restricted sandbox environment, effectively breaking down the security isolation that protects the operating system from potentially harmful browser activities.
The technical flaw manifests in how Chrome processes untrusted HTML content containing crafted Web Authentication requests that manipulate input validation mechanisms. This allows attackers to construct malicious payloads that exploit weaknesses in the authentication framework's data handling procedures, potentially enabling privilege escalation and full system compromise. The vulnerability operates at the intersection of web browser security architecture and operating system sandboxing principles, where proper input sanitization should prevent malicious data from being processed within the trusted execution environment.
The operational impact of this vulnerability is severe as it transforms a typical browser-based attack vector into a system-level compromise capability. Attackers who have already achieved renderer process control can use this flaw to escalate privileges and gain unrestricted access to device resources, potentially accessing sensitive user data, executing arbitrary code, or establishing persistent backdoors. This represents a significant threat to mobile device security where sandbox escape capabilities can lead to complete device compromise.
Mitigation strategies should focus on immediate browser updates to version 151.0.7922.72 or later, which contains the necessary patches addressing the input validation deficiencies. Organizations should also implement additional security measures including network monitoring for suspicious authentication requests, application whitelisting to restrict unauthorized code execution, and regular security assessments of mobile browser environments. The vulnerability aligns with CWE-20 (Improper Input Validation) and maps to ATT&CK techniques involving privilege escalation and sandbox evasion, emphasizing the need for comprehensive defensive measures beyond simple patch management.
Security teams must prioritize monitoring for exploitation attempts targeting this specific vulnerability while implementing layered defenses including secure coding practices, regular security updates, and robust incident response procedures. The flaw demonstrates the critical importance of input validation in security-critical components and highlights how seemingly isolated API vulnerabilities can create pathways to complete system compromise when proper boundary enforcement mechanisms are absent. Organizations should conduct thorough risk assessments to identify potential exploitation vectors and ensure comprehensive coverage of all mobile browser environments that may be affected by similar input validation weaknesses.