CVE-2026-17787 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in DevTools in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/31/2026
This vulnerability represents a critical flaw in Google Chrome's DevTools implementation that enabled remote code execution through improper enforcement of the same origin policy. The issue existed in versions prior to 151.0.7922.72 and allowed attackers to craft malicious HTML pages that could bypass fundamental web security boundaries. The vulnerability stems from inadequate validation mechanisms within the DevTools component that should have prevented cross-origin access attempts. When a user visited a specially crafted webpage, the DevTools interface would incorrectly permit operations that should have been restricted by the same origin policy, effectively allowing attackers to access resources from different domains without proper authorization.
The technical implementation flaw resides in how Chrome's DevTools handles cross-origin resource requests and security boundaries. This particular vulnerability falls under the category of privilege escalation and access control bypass, with potential implications for data confidentiality and system integrity. The same origin policy serves as a fundamental security mechanism that prevents scripts from one origin from accessing resources from another origin without explicit permission. When this policy is violated through improper DevTools implementation, it creates a pathway for attackers to perform unauthorized operations across domain boundaries.
The operational impact of this vulnerability extends beyond simple data access violations and could enable more sophisticated attacks including information disclosure, session hijacking, or even remote code execution depending on the specific context of exploitation. Attackers could leverage this flaw to access sensitive user data, cookies, or local storage from other origins, potentially leading to account compromise or further escalation within affected systems. The medium severity rating reflects the fact that while exploitation requires user interaction through a malicious webpage, the potential for unauthorized access remains significant given the broad scope of what could be accessed through DevTools interfaces.
This vulnerability aligns with several cybersecurity frameworks including CWE-284 which addresses improper access control, and relates to ATT&CK techniques involving privilege escalation and credential access. The flaw demonstrates how browser development components can introduce security gaps that bypass fundamental web security models. Organizations should prioritize updating Chrome installations immediately to version 151.0.7922.72 or later to mitigate this risk. Additional protective measures include implementing strict content security policies, monitoring for unusual DevTools activity, and maintaining awareness of browser security updates through official channels. The incident underscores the importance of comprehensive security testing for browser development tools that operate with elevated privileges and access to sensitive system resources.