CVE-2026-17893 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Updater in Google Chrome on Mac 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 updater component on macOS systems, where insufficient input validation creates a pathway for remote attackers to bypass security boundaries. The flaw exists within the updater module that handles software updates and validation processes, specifically when processing untrusted input from web content. When an attacker compromises a renderer process through a malicious HTML page, they can exploit this vulnerability to escalate privileges and escape the sandboxed environment that normally isolates browser components from the underlying operating system.
The technical implementation of this vulnerability stems from inadequate sanitization and validation of input parameters within the updater's processing pipeline. The Chromium security model relies heavily on process isolation and sandboxing to prevent malicious code execution from affecting the broader system, but this weakness creates a potential bypass mechanism. When untrusted HTML content is processed through the renderer and subsequently passed to the updater component, the lack of proper validation allows crafted input to manipulate the update process in ways that were not intended by the developers.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security architecture designed to isolate browser processes. Attackers can leverage this flaw to execute arbitrary code with elevated privileges, potentially gaining access to sensitive system resources, user data, or even full system control depending on the execution environment. The medium severity classification reflects the relatively narrow attack surface but significant potential consequences when successfully exploited in targeted scenarios.
This vulnerability aligns with CWE-20, which describes improper input validation as a fundamental security weakness that enables various exploitation techniques including privilege escalation and sandbox bypasses. From an ATT&CK framework perspective, this represents a technique for privilege escalation through process manipulation and sandbox escape, specifically targeting the Chromium browser's security boundaries and potentially enabling further lateral movement within compromised systems.
The recommended mitigation strategy involves immediate deployment of Chrome version 151.0.7922.72 or later, which includes input validation improvements and enhanced sanitization mechanisms for the updater component. Organizations should also implement network monitoring to detect suspicious update-related traffic patterns and maintain comprehensive patch management procedures to ensure timely remediation of similar vulnerabilities across their browser environments. Additional protective measures include implementing web application firewalls, restricting browser access to untrusted domains, and maintaining regular security assessments of browser components to identify potential sandbox escape vectors.