CVE-2026-58295 in Edge
Summary
by MITRE • 07/04/2026
Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.
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Analysis
by VulDB Data Team • 07/04/2026
Type confusion vulnerabilities represent a critical class of software flaws that occur when a program uses a resource with an inappropriate data type or memory layout, often leading to unpredictable behavior and potential exploitation. This specific vulnerability in Microsoft Edge Chromium-based browsers stems from improper handling of object types during runtime operations, creating opportunities for attackers to manipulate memory structures and bypass security controls. The flaw manifests when the browser's rendering engine encounters situations where objects are expected to be of one type but are actually of another, leading to incorrect memory access patterns that can be leveraged by malicious actors.
The technical implementation of this vulnerability involves scenarios where JavaScript objects or DOM elements are manipulated in ways that cause the browser's memory management system to treat them as different data types than intended. When Microsoft Edge processes web content containing malicious code, particularly in complex rendering scenarios involving dynamic object creation and type changes, the Chromium engine may fail to properly validate type consistency across operations. This misalignment between expected and actual object types can result in memory corruption that allows attackers to execute arbitrary code or manipulate browser security features.
Security implications of this vulnerability extend beyond simple privilege escalation to include potential bypassing of critical browser security mechanisms such as sandbox isolation, cross-origin resource restrictions, and content security policies. Attackers can exploit the type confusion to gain unauthorized access to sensitive browser resources, potentially leading to full system compromise when combined with other exploitation techniques. The network-based nature of this vulnerability means that attackers do not require local system access or physical presence, making it particularly dangerous in targeted attack scenarios where web-based delivery mechanisms such as drive-by downloads or malicious advertisements can be employed.
The operational impact affects users of Microsoft Edge browsers across various operating systems including Windows 10, Windows 11, and potentially other platforms where the Chromium engine is implemented. Organizations relying on Edge for business operations face significant risk exposure, particularly in environments where users may encounter untrusted web content or where social engineering attacks are prevalent. The vulnerability's exploitation potential makes it attractive to threat actors targeting enterprise environments, government agencies, or high-value individuals who use Microsoft Edge as their primary browser.
Mitigation strategies should include immediate deployment of Microsoft security updates and patches, which typically address the underlying type validation issues in the browser's rendering engine. Organizations should implement network-level controls such as web application firewalls and content filtering solutions to reduce exposure to malicious web content. Browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and using sandboxing configurations can provide additional layers of protection. Security teams should monitor for indicators of compromise related to this vulnerability and consider implementing threat hunting activities focused on anomalous browser behavior or unusual memory access patterns that might indicate exploitation attempts.
This vulnerability aligns with CWE-479 which specifically addresses the use of incompatible types in resource access operations, representing a fundamental flaw in type safety mechanisms. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence through browser-based exploitation, potentially enabling adversaries to establish footholds within target environments. The security community has recognized such flaws as particularly dangerous due to their ability to bypass multiple security controls simultaneously, making them prime targets for advanced persistent threat actors seeking long-term access to compromised systems.