CVE-2026-17817 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in ReportingAndNEL in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability resides within the reporting and network error logging functionality of google chrome, specifically affecting versions prior to 1510792272. The issue stems from an inadequate implementation that fails to properly validate cross-origin data handling within the reporting and network error logging framework. The flaw allows remote attackers to craft malicious html pages that can extract sensitive information from different origins, potentially exposing user data or system information that should remain isolated between domains.
The technical mechanism behind this vulnerability involves the improper sanitization of cross-origin resource requests within the browser's reporting infrastructure. When chrome processes network error logs and reporting mechanisms, it fails to adequately separate or validate data flows between different security domains. This creates an attack surface where malicious actors can construct html pages that trigger specific reporting behaviors which inadvertently leak information across origin boundaries. The vulnerability specifically impacts how chrome handles network error logging and reporting components that are designed to collect diagnostic information from web applications.
The operational impact of this vulnerability extends beyond simple data leakage, as it represents a potential pathway for more sophisticated attacks targeting user privacy and system integrity. Attackers could exploit this flaw to gather sensitive information about user activities, network configurations, or application behaviors across different origins. The medium severity classification indicates that while the vulnerability does not provide direct code execution capabilities, it enables unauthorized data access that could be combined with other techniques to create more significant security breaches. This type of cross-origin data leakage can lead to privacy violations and potentially expose information that could be used for further exploitation.
From a cybersecurity perspective, this vulnerability aligns with common weakness enumerations related to improper input validation and cross-origin resource sharing issues. The flaw demonstrates the complexity involved in implementing secure reporting mechanisms within modern browsers where multiple security domains must be properly isolated while still allowing legitimate diagnostic functionality. Organizations should implement immediate mitigations by updating chrome installations to version 1510792272 or later, which contains the necessary patches to address the cross-origin data leakage through the reporting and network error logging components. Additionally, web administrators should monitor their applications for potential exploitation attempts and ensure proper security headers are implemented to limit the attack surface available to malicious actors.
This vulnerability also highlights the importance of secure implementation practices in browser security subsystems, particularly around how diagnostic and reporting features handle cross-origin communications. The fix typically involves implementing stricter validation mechanisms that prevent unauthorized data access while maintaining legitimate diagnostic capabilities. Security teams should consider this issue when conducting vulnerability assessments of web applications that rely on chrome-based browsers, as it represents a potential vector for information disclosure attacks targeting user privacy and system security.