CVE-2018-8294 in Edge
Summary
by MITRE
A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-8280, CVE-2018-8286, CVE-2018-8290.
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Analysis
by VulDB Data Team • 06/19/2026
The vulnerability described in CVE-2018-8294 represents a critical memory corruption issue within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine responsible for executing web content. This flaw specifically manifests when the engine processes objects in memory, creating a pathway for remote code execution that could be exploited by attackers. The Chakra engine is integral to Microsoft Edge's functionality, enabling the interpretation and execution of JavaScript code that powers modern web applications. The vulnerability affects not only Microsoft Edge but also ChakraCore, which is Microsoft's open-source JavaScript engine used in various applications beyond the browser environment. The distinction from related CVEs such as CVE-2018-8280, CVE-2018-8286, and CVE-2018-8290 highlights that this represents a unique memory handling flaw within the Chakra engine's object management mechanisms.
The technical nature of this vulnerability stems from improper memory management when the Chakra engine handles object references and memory allocation during JavaScript execution. Attackers can exploit this weakness by crafting malicious web content that triggers specific memory corruption patterns within the engine's object handling routines. This typically involves manipulating JavaScript objects in ways that cause the engine to access invalid memory locations or corrupt memory structures that should remain intact during normal execution. The vulnerability can be triggered through various vectors including crafted web pages, malicious JavaScript code, or even through compromised web content that gets executed within the browser context. The memory corruption occurs at a fundamental level where the engine's object model management fails to properly validate or handle memory operations, creating opportunities for arbitrary code execution.
The operational impact of this vulnerability extends beyond simple browser exploitation to potentially compromise entire user systems when attackers leverage this flaw. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary code with the privileges of the user running the affected browser. This creates significant risk for enterprise environments where Microsoft Edge is the default browser, as attackers could use this vulnerability to gain unauthorized access to sensitive corporate data, deploy malware, or establish persistent access points. The remote nature of the exploit means that attackers do not require physical access to target systems, making this vulnerability particularly dangerous in enterprise and consumer environments. Organizations using ChakraCore in their applications also face elevated risk, as the same memory corruption issues could be exploited in non-browser contexts where the engine is embedded.
Mitigation strategies for CVE-2018-8294 should include immediate application of Microsoft security patches and updates to address the specific memory corruption issues within the Chakra engine. Organizations should implement browser hardening measures including disabling unnecessary JavaScript features, implementing content security policies, and using sandboxing techniques to limit the impact of potential exploitation. Network-level protections such as web application firewalls and intrusion detection systems can help identify and block exploitation attempts targeting this vulnerability. Security teams should also consider implementing automated patch management processes to ensure rapid deployment of security updates across all affected systems. The vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and may also relate to ATT&CK techniques involving privilege escalation and remote code execution through browser-based attacks. Regular security assessments and penetration testing should be conducted to identify potential exploitation vectors and ensure that mitigation measures remain effective against evolving attack techniques.