CVE-2026-58289 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 execute code over a network.
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Analysis
by VulDB Data Team • 07/04/2026
Type confusion vulnerabilities represent a critical class of software defects that occur when a program uses a variable or object with an inappropriate data type, often leading to memory corruption and potential code execution. In the context of Microsoft Edge Chromium-based browser, this specific vulnerability manifests when the browser's rendering engine processes resources with conflicting type expectations, creating opportunities for attackers to manipulate memory layout and execute arbitrary code remotely. The flaw typically arises from insufficient type checking mechanisms within the browser's JavaScript engine or rendering components that fail to properly validate object types during runtime operations.
The technical implementation of this type confusion vulnerability exploits memory management inconsistencies in Edge's Chromium engine where objects are improperly typed or cast between different data structures. Attackers can leverage this weakness by crafting malicious web content that triggers specific code paths within the browser's execution environment, causing the program to interpret memory locations as different data types than intended. This misalignment enables attackers to overwrite critical memory segments including function pointers, return addresses, or control flow data structures that ultimately allow for remote code execution without requiring local system access or user interaction beyond visiting a malicious website.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where Microsoft Edge serves as the primary browser for web-based applications and employee productivity tools. The network-based nature of exploitation means that attackers can compromise systems simply by delivering malicious content through standard web browsing activities, making it particularly dangerous in corporate networks where endpoint security may not fully protect against such sophisticated attacks. The vulnerability's impact extends beyond individual user devices to potentially enable broader lateral movement within networks once initial compromise occurs, especially when combined with other exploitation techniques or when targeting privileged user accounts.
Security professionals should implement multiple layers of defense to mitigate this type confusion vulnerability within Microsoft Edge environments. Organizations must maintain up-to-date browser versions through proper patch management procedures, as Microsoft typically releases security updates addressing such issues in their regular release cycles. Network-based mitigations including web application firewalls and content filtering solutions can help detect and block known malicious payloads before they reach end-user systems. Additionally, implementing strict browser hardening configurations such as disabling unnecessary JavaScript features, enabling sandboxing mechanisms, and configuring secure browsing policies can significantly reduce the attack surface available to exploit this particular vulnerability. The weakness aligns with CWE-461, which addresses improper handling of data type conflicts in software implementations, while also mapping to ATT&CK technique T1203 for exploiting web-based applications and T1059 for remote code execution through browser-based attacks.