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Public proof of conceptFix available

CVE-2018-8466

A public proof of concept exists; no exploitation attested.

  • Published2018-09-13
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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-2018-8367, CVE-2018-8465, CVE-2018-8467.

Timeline

dates in UTC
  1. 2018-10-09Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-8466?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-8466?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Microsoft chakracore
BranchAffectedFixed in
1.10≤ 1.10.1no fix published
Microsoft edgeversion to verify
BranchAffectedFixed in
—all versionsno fix published
Microsoft.ChakraCore
BranchAffectedFixed in
1.11< 1.11.11.11.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-45571
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2018-09-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4c93-q79v-mw45

Frequently asked questions

What is CVE-2018-8466?

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-2018-8367, CVE-2018-8465, CVE-2018-8467.

Is CVE-2018-8466 actively exploited?

Active exploitation of CVE-2018-8466 has not been confirmed. Its EPSS score was 69.0% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-8466?

CVE-2018-8466 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record