CVE-2026-11244 in Chrome
Summary
by MITRE • 06/05/2026
Insufficient validation of untrusted input in WebAuthentication in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to bypass same origin policy via a crafted HTML page. (Chromium security severity: Low)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 06/05/2026
This vulnerability resides in the web authentication component of google chrome and represents a critical flaw in the browser's security architecture that could be exploited by attackers who have already compromised the renderer process. the issue stems from insufficient validation of untrusted input within the web authentication framework which allows malicious actors to craft specially designed html pages that can bypass the same origin policy enforcement mechanisms. the same origin policy serves as a fundamental security boundary in web browsers that prevents scripts from one origin from accessing resources from another origin without proper authorization. when this protection is circumvented, it creates a dangerous escalation path for attackers who have already gained access to the renderer process, as they can now access resources that should normally be restricted to specific origins.
the technical nature of this vulnerability involves a breakdown in input validation that occurs within the web authentication subsystem of chrome. when the browser processes crafted html content, the insufficient validation allows malicious input to be processed without proper sanitization or verification, enabling the attacker to manipulate the authentication flow and gain unauthorized access to resources. this flaw specifically affects versions of chrome prior to 149.0.7827.53, indicating that the vulnerability has been addressed in subsequent releases through improved input validation mechanisms and enhanced security controls within the web authentication framework. the chromium security severity classification of low suggests that while the vulnerability exists in the broader chromium codebase, its exploitation requires a pre-existing compromise of the renderer process, which significantly limits its attack surface.
the operational impact of this vulnerability extends beyond simple privilege escalation as it represents a potential pathway for attackers to perform cross-origin data theft or manipulation. once the same origin policy is bypassed, an attacker could potentially access cookies, local storage, or other origin-specific resources that should be protected from unauthorized access. this could lead to session hijacking, data exfiltration, or the ability to impersonate legitimate users within web applications that rely on proper origin isolation. the vulnerability also demonstrates the importance of defense in depth principles in browser security, as even when an attacker gains access to one component of the browser, additional security controls should prevent further escalation. this particular flaw aligns with common attack patterns documented in the attack pattern taxonomy where attackers leverage existing compromises to expand their access within a system.
from a compliance and security standards perspective, this vulnerability relates to several key security principles including cwe-20, which covers "improper input validation," and represents a failure to properly enforce security boundaries that should be maintained by web browsers. the vulnerability also connects to attack techniques described in the attack pattern knowledge base where attackers exploit browser security flaws to bypass isolation mechanisms. organizations should ensure that their chrome installations are updated to version 149.0.7827.53 or later to mitigate this risk, as the update would include proper input validation and enhanced security controls within the web authentication subsystem. additionally, implementing network-level security controls and monitoring for unusual browser behavior could help detect exploitation attempts, though the primary mitigation remains keeping browser software up to date with the latest security patches. the vulnerability serves as a reminder of the critical importance of maintaining current security software and understanding that even minor security flaws can provide attackers with significant capabilities when combined with other compromises.