CVE-2018-8355

HIGH

Microsoft Browsers - Memory Corruption

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2018-8355. PoCs published by Google Security Research.

AI-analyzed exploit summary This PoC exploits a type confusion vulnerability in ChakraCore's String.prototype.localeCompare by manipulating the ImplicitCallFlags during bailout, allowing arbitrary JavaScript execution. The exploit leverages partial optimization and a crafted toString method to achieve 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-2018-8353, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8373, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · javascriptdoswindows
https://www.exploit-db.com/exploits/45432

This PoC exploits a type confusion vulnerability in ChakraCore's String.prototype.localeCompare by manipulating the ImplicitCallFlags during bailout, allowing arbitrary JavaScript execution. The exploit leverages partial optimization and a crafted toString method to achieve code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
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 (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1041457
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/104978
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/45432/

Scores

CVSS v3 7.5
EPSS 0.7958
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-787
Status published
Products (4)
microsoft/chakracore
microsoft/edge
microsoft/internet_explorer 11
nuget/Microsoft.ChakraCore 0 - 1.10.2NuGet
Published Aug 15, 2018
Tracked Since Feb 18, 2026