CVE-2026-15775 in Chrome
Summary
by MITRE • 07/15/2026
Inappropriate implementation in V8 in Google Chrome prior to 150.0.7871.125 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical security flaw in the V8 JavaScript engine used by Google Chrome, specifically affecting versions prior to 150.0.7871.125. The issue stems from an inadequate implementation that permits remote attackers to circumvent the fundamental same origin policy protection mechanisms that govern web browser security. The same origin policy serves as a cornerstone of web security by preventing scripts from one origin from accessing resources or data from another origin, thereby protecting users from cross-site scripting attacks and data leakage. When this policy is bypassed, it creates a severe attack surface that allows malicious actors to access sensitive information across different domains.
The technical nature of this vulnerability involves a flaw in how V8 handles certain JavaScript operations or memory management scenarios that should normally be restricted by browser security policies. Attackers can craft specific HTML pages containing malicious JavaScript code that exploits this implementation gap to gain unauthorized access to resources that should be protected by the same origin policy. This typically involves manipulating how the engine processes cross-origin requests, object properties, or memory references in ways that violate expected security boundaries.
The operational impact of this vulnerability is significant as it allows remote attackers to execute potentially harmful actions without user interaction or explicit permission. Once exploited, the vulnerability could enable attackers to access cookies, local storage, session data, or other sensitive information from different origins. This bypass effectively undermines the browser's security model and could lead to session hijacking, data theft, or further escalation attacks against users. The high chromium security severity rating indicates that this vulnerability can be exploited remotely and has substantial potential for widespread impact across web applications.
Mitigation strategies should focus on immediate browser updates to versions 150.0.7871.125 or later where the vulnerability has been patched. Organizations should also implement additional security measures such as content security policies, strict header configurations, and regular security audits of web applications. Network-based protections like web application firewalls can provide additional layers of defense, while security teams should monitor for any exploitation attempts in their environments. This vulnerability aligns with CWE-284 access control issues and maps to ATT&CK techniques related to privilege escalation and credential access through browser exploitation methods. The fix typically involves strengthening the validation checks within V8's implementation to properly enforce same origin policy boundaries during JavaScript execution.