CVE-2019-1192 in Edge
Summary
by MITRE
A security feature bypass vulnerability exists when Microsoft browsers improperly handle requests of different origins. The vulnerability allows Microsoft browsers to bypass Same-Origin Policy (SOP) restrictions, and to allow requests that should otherwise be ignored. An attacker who successfully exploited the vulnerability could force the browser to send data that would otherwise be restricted. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers and then convince a user to view the website. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how affected Microsoft browsers handle different-origin requests.
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Analysis
by VulDB Data Team • 02/21/2026
The vulnerability described in CVE-2019-1192 represents a critical security feature bypass affecting Microsoft browsers that fundamentally undermines the Same-Origin Policy (SOP) enforcement mechanism. This weakness enables attackers to circumvent core web security controls that are designed to prevent unauthorized cross-origin requests, creating a significant risk for users who rely on browser-based applications. The flaw specifically manifests when browsers improperly process requests originating from different domains, allowing malicious actors to exploit the inconsistency in origin validation mechanisms. This bypass affects the fundamental security model that protects users from cross-site scripting attacks, data theft, and unauthorized resource access. The vulnerability operates at the core of web browser security architecture, where SOP serves as the primary defense against malicious cross-origin operations that could compromise user data and system integrity.
The technical implementation of this vulnerability stems from how Microsoft browsers handle cross-origin resource sharing and origin validation during HTTP request processing. When browsers encounter requests from different origins, they should enforce strict policy checks to prevent unauthorized access to resources that belong to other domains. However, this flaw allows certain requests to bypass these validation checks, enabling attackers to craft malicious web pages that can force the browser to make unauthorized requests to protected resources. The exploitation occurs through carefully constructed web content that triggers the browser's request handling logic in a way that circumvents normal security boundaries. This behavior creates a pathway for attackers to access sensitive data or perform actions that should be restricted based on origin policies. The vulnerability essentially allows an attacker to manipulate the browser's security context, effectively weakening the isolation between different web origins that is essential for maintaining web application security.
The operational impact of CVE-2019-1192 extends beyond simple data theft to encompass a broad range of potential security breaches that can compromise user privacy and system integrity. An attacker exploiting this vulnerability could gain unauthorized access to user sessions, personal data, financial information, or corporate resources that are normally protected by cross-origin restrictions. The attack vector through compromised websites and user-generated content makes this vulnerability particularly dangerous as it can be exploited through legitimate web browsing activities without requiring users to take specific actions beyond visiting malicious sites. This creates a significant risk for organizations where employees regularly browse the internet and interact with web content that may contain malicious elements. The vulnerability's presence in Microsoft browsers means that a large user base is potentially exposed, as these browsers are widely used across both personal and enterprise environments, amplifying the potential impact of successful exploitation attempts.
Organizations should implement immediate mitigations including applying the security update provided by Microsoft to address the root cause of the vulnerability. The patch modifies the browser's handling of cross-origin requests to properly enforce Same-Origin Policy restrictions, thereby preventing the bypass mechanism that enables exploitation. Network administrators should also consider implementing additional security controls such as content filtering solutions, web application firewalls, and browser hardening measures to reduce the attack surface. Security monitoring should focus on detecting anomalous cross-origin request patterns that might indicate exploitation attempts, while user education programs should emphasize the importance of avoiding suspicious websites and maintaining updated browser software. The mitigation strategy should also include regular security assessments to identify potentially compromised systems and ensure that all affected browsers have been properly updated to prevent attackers from leveraging this vulnerability in targeted campaigns. This vulnerability aligns with CWE-345 Insufficient Verification of Data Authenticity and relates to ATT&CK technique T1071.001 Application Layer Protocol Web Protocols, highlighting the need for comprehensive security measures that address both browser-level and network-level protections.