Description

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.4",
  "pubDate": "2026-08-11T20:18:44.243Z",
  "pubdate": "2026-08-11T20:18:44.243Z",
  "executiveSummary": "An access of resource using incompatible type, commonly referred to as type confusion, has been identified in Microsoft Edge (Chromium-based). This critical vulnerability allows an unauthorized remote attacker to execute arbitrary code over a network.\nThe flaw stems from improper handling of object types within the affected browser architecture, specifically inside the rendering or script execution engine. When processing maliciously crafted web content, the application may misinterpret data types, leading to memory corruption.\nSuccessful exploitation of this vulnerability can result in remote code execution within the context of the browser process, potentially allowing attackers to compromise the underlying operating system user session depending on the applied sandbox restrictions.\nThe risk implication is severe due to the potential for zero-click or drive-by compromise scenarios where a user navigates to a malicious URL or views specially crafted web content. The attack vector is network-based, requiring no prior authentication or elevated privileges from the adversary, though it relies on user interaction in standard web-browsing scenarios.",
  "technicalDetails": "The root cause of the vulnerability resides in the component handling dynamic object types within Microsoft Edge (Chromium-based). Type confusion vulnerabilities occur when a resource is allocated or initialized under one type but accessed or operated upon as if it were a different, incompatible type.\nIn the context of modern Chromium-based browsers, this frequently manifests within the JavaScript engine (such as V8) or the Document Object Model (DOM) implementation during optimized JIT (Just-In-Time) compilation or object casting operations.\nDuring the attack flow, an adversary crafts a malicious web page containing specially constructed scripts designed to trigger ambiguous type states during runtime execution. When Microsoft Edge parses and executes this payload, the type confusion flaw leads to incorrect memory offset calculations or out-of-bounds read and write primitives.\nAn unauthorized attacker leverages these memory corruption primitives to manipulate internal object structures, achieve arbitrary read/write capabilities within the browser's memory space, and eventually redirect execution flow to attacker-supplied shellcode.\nThe affected component is exposed over the network via standard web browsing protocols (HTTP/HTTPS), requiring the victim to visit a malicious site or interact with compromised web assets. Exploitation requires no authentication and can be executed with standard user privileges inside the browser sandbox, though an attacker would typically chain this vulnerability with a sandbox escape to achieve full system compromise."
}