CVE-2026-17754 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Blink 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 • 07/30/2026
This vulnerability represents a critical flaw in the Blink rendering engine that powers Google Chrome and related browsers, specifically affecting versions prior to 151.0.7922.72. The issue stems from an inadequate implementation of same origin policy enforcement mechanisms within the browser's core rendering components. The same origin policy serves as a fundamental security boundary in web browsers, preventing scripts from one origin from accessing resources or data from another origin to protect user privacy and prevent cross-site scripting attacks. When this policy is improperly implemented, it creates opportunities for malicious actors to bypass these essential protections.
The technical nature of this vulnerability allows remote attackers to craft specially designed HTML pages that can exploit the flawed implementation to gain unauthorized access to resources that should normally be restricted by the same origin policy. This type of flaw typically involves improper handling of cross-origin requests or insufficient validation of resource access permissions within the browser's rendering engine. The vulnerability exists at the core level where Blink processes web content, making it particularly dangerous as it can be triggered simply by visiting a malicious webpage without requiring any additional user interaction or privilege escalation.
The operational impact of this vulnerability extends beyond simple data access violations and could enable attackers to perform a range of malicious activities including but not limited to cross-site request forgery attacks, session hijacking, and unauthorized data exfiltration. Attackers could potentially access sensitive information from different origins, manipulate browser behavior, or establish persistent access points within the user's browsing environment. The medium severity classification indicates that while the vulnerability may not be immediately exploitable in all scenarios, it represents a significant risk to web security and user privacy when successfully exploited.
This vulnerability aligns with CWE-346, which addresses "Improper Verification of Source of a Communication Channel", specifically relating to the failure to properly validate or verify communication boundaries within the browser's security model. The flaw also connects to ATT&CK technique T1059.001, which involves executing malicious code through web browsers, as attackers could leverage this vulnerability to inject and execute unauthorized scripts against users' browsers. The remediation strategy must include immediate patching of affected browser versions, implementation of additional network-level security controls, and enhanced monitoring for suspicious cross-origin access patterns in user environments.
Organizations should prioritize updating all affected Chrome installations to version 151.0.7922.72 or later, as this update contains the necessary fixes to properly enforce same origin policy restrictions. Additionally, implementing content security policies and browser hardening measures can provide additional layers of protection against exploitation attempts. Security teams should monitor for indicators of compromise related to malicious web pages that might attempt to exploit this vulnerability, particularly focusing on unexpected cross-origin resource access patterns that could signal exploitation attempts within their networks.