CVE-2018-8291

HIGH

Microsoft Browsers - Memory Corruption

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2018-8291. PoCs published by Google Security Research.

AI-analyzed exploit summary This PoC exploits a type confusion vulnerability in ChakraCore (CVE-2018-8291) by manipulating the 'IsShadowed' field in DictionaryPropertyDescriptor during a CopyFrom operation. The exploit triggers incorrect handling of property descriptors, leading to potential arbitrary code execution.

Description

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore, Internet Explorer 11, Microsoft Edge. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8296, CVE-2018-8298.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · javascriptdoswindows
https://www.exploit-db.com/exploits/45215

This PoC exploits a type confusion vulnerability in ChakraCore (CVE-2018-8291) by manipulating the 'IsShadowed' field in DictionaryPropertyDescriptor during a CopyFrom operation. The exploit triggers incorrect handling of property descriptors, leading to potential arbitrary code execution.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft ChakraCore (Edge/IE JavaScript engine)
No auth needed
Prerequisites: Target must be using a vulnerable version of ChakraCore (e.g., Microsoft Edge or Internet Explorer)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/104637
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1041256
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1041258
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/45215/

Scores

CVSS v3 7.5
EPSS 0.7879
EPSS Percentile 99.1%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-843
Status published
Products (4)
microsoft/chakracore < 1.10.1
microsoft/edge
microsoft/internet_explorer 11
nuget/Microsoft.ChakraCore 0 - 1.10.1NuGet
Published Jul 11, 2018
Tracked Since Feb 18, 2026