CVE-2018-8315 in Internet Explorer
Summary
by MITRE
An information disclosure vulnerability exists when the browser scripting engine improperly handle object types, aka "Microsoft Scripting Engine Information Disclosure Vulnerability." This affects ChakraCore, Internet Explorer 11, Microsoft Edge, Internet Explorer 10.
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Analysis
by VulDB Data Team • 05/19/2026
The vulnerability identified as CVE-2018-8315 represents a critical information disclosure flaw within Microsoft's scripting engine implementations, specifically affecting ChakraCore JavaScript engine and web browsers including Internet Explorer 11 and Microsoft Edge. This vulnerability stems from improper handling of object types within the browser's scripting environment, creating potential pathways for attackers to extract sensitive information from memory locations that should remain protected. The flaw manifests when the scripting engine fails to properly validate or manage object references during execution, leading to unintended data exposure that could reveal system internals, memory contents, or other confidential information.
The technical nature of this vulnerability aligns with CWE-200, which describes improper exposure of information, and demonstrates how flaws in object type handling within scripting engines can create information disclosure opportunities. The vulnerability operates at the intersection of memory management and object-oriented programming within the browser's JavaScript engine, where improper object type validation allows attackers to access memory regions that contain sensitive data. This type of vulnerability typically arises from insufficient bounds checking or type validation mechanisms that should prevent unauthorized access to object memory representations. The affected components include the ChakraCore engine used in Microsoft Edge, Internet Explorer 11, and Internet Explorer 10, indicating a widespread impact across Microsoft's browser ecosystem.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable more sophisticated attacks by providing attackers with memory layout information that could be leveraged for exploitation. An attacker could potentially use this information to craft more effective buffer overflow attacks, bypass security mitigations, or perform advanced exploitation techniques that rely on knowing memory addresses and object layouts. The vulnerability's presence in multiple browser versions creates a significant attack surface, particularly for targeted attacks against users who may be running older or less frequently updated browser versions. This type of information disclosure vulnerability is particularly dangerous because it can provide attackers with the foundational knowledge needed to perform more complex exploitation techniques, making it a preferred target for advanced persistent threat actors.
Mitigation strategies for CVE-2018-8315 should prioritize immediate patch deployment through Microsoft's regular security updates, as this vulnerability was addressed in Microsoft's security bulletins released in conjunction with the vulnerability disclosure. Organizations should ensure comprehensive patch management processes are in place to maintain up-to-date browser installations across all endpoints. Additional defensive measures include implementing browser security hardening configurations, enabling security features such as Address Space Layout Randomization, Data Execution Prevention, and Enhanced Mitigation Experience Toolkit components. Network-level protections such as web application firewalls and content filtering solutions can provide additional layers of defense, while monitoring systems should be configured to detect unusual patterns of information disclosure attempts. The vulnerability's classification under the ATT&CK framework would place it in the information gathering phase, specifically related to reconnaissance activities that precede more serious exploitation attempts, making early detection and remediation critical for maintaining security posture.