CVE-2026-17679 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Print Preview in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to leak cross-origin data 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 security flaw in Google Chrome's print preview functionality that emerged from insufficient input validation mechanisms within the browser's rendering engine. The issue specifically affected versions prior to 151.0.7922.72 and created a pathway for remote attackers to exploit cross-origin data leakage when they had already compromised the renderer process through separate attack vectors. The vulnerability stems from the improper validation of untrusted HTML input within the print preview component, which operates as a distinct sub-system within Chrome's architecture designed to handle document rendering for printing purposes.
The technical implementation flaw allows an attacker who has achieved renderer process compromise to craft malicious HTML content that bypasses normal cross-origin restrictions typically enforced by the browser's security model. This occurs because the print preview subsystem does not adequately validate or sanitize input data before processing it, creating a vector through which sensitive information from different origins can be accessed and potentially exfiltrated. The vulnerability operates at a fundamental level where the boundary checking between different security domains fails to properly isolate the print preview functionality from other browser components that should maintain strict separation.
The operational impact of this vulnerability is significant as it provides attackers with a method to escalate privileges within the compromised environment, particularly when they have already gained access to the renderer process through other means. This creates a dangerous escalation path where initial compromises can be leveraged to extract additional sensitive data from cross-origin contexts that should normally be protected by browser security policies. The threat model assumes an attacker has already achieved a foothold in the browser's rendering environment, but this vulnerability enables them to expand their access beyond the original compromise boundaries.
Security researchers have classified this issue as High severity according to Chromium's security framework, reflecting its potential for serious data exposure and privilege escalation within compromised browser environments. The vulnerability aligns with common weakness enumerations related to inadequate input validation and insufficient boundary checking in web browser components, specifically mapping to CWE-20 for improper input validation and CWE-215 for information exposure through process control. From an attack framework perspective, this vulnerability could be categorized under ATT&CK technique T1074 for data staging and potentially T1566 for initial access through compromised renderer processes.
The recommended mitigation strategy involves immediate upgrading to Chrome version 151.0.7922.72 or later where the input validation mechanisms have been strengthened to properly sanitize untrusted HTML content within the print preview subsystem. Organizations should also implement network monitoring to detect unusual print preview activities that might indicate exploitation attempts, while maintaining comprehensive browser update policies to ensure all systems run patched versions. Additional defensive measures include implementing strict content security policies and monitoring for cross-origin data access patterns that could indicate exploitation of similar vulnerabilities in other browser components.