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CVE-2018-8653 is a remote code execution vulnerability in the legacy JScript scripting engine used by Microsoft Internet Explorer 9, 10, and 11. The flaw arises from improper handling of objects in memory, resulting in memory corruption in the scripting engine. Public reporting on the bug class indicates the issue involves garbage-collection tracking failures in JScript, specifically that the this variable is not tracked by the garbage collector during an isPrototypeOf callback, leading to use-after-free style memory corruption and attacker-controlled script execution conditions. The vulnerability was observed exploited in the wild and is part of a broader cluster of Internet Explorer JScript garbage-collection vulnerabilities later associated with related flaws such as CVE-2019-1367, CVE-2019-1429, and CVE-2020-0674. A successful exploit can execute arbitrary code in the security context of the current user.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An earlier in-the-wild exploited jscript vulnerability from the same bug class as CVE-2019-1367.
An earlier Internet Explorer JScript garbage-collection bug in the same bug class as CVE-2020-0674, used as a closely related prior vulnerability and variant comparison.
An Internet Explorer legacy JScript engine vulnerability reported as an in-the-wild zero-day and referenced in the context of exploit kit adoption of IE exploits.
Internet Explorer legacy JScript (jscript.dll) vulnerability previously used in in-the-wild IE exploitation chains (mentioned for contrast with CVE-2020-1380).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.