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CVE-2025-65716 is a high-severity vulnerability in the Markdown Preview Enhanced extension for Visual Studio Code, reported in version 0.8.18 and also described as affecting all versions. The flaw stems from unsafe rendering of HTML content in Markdown preview, specifically insufficient sanitization or restriction of attacker-controlled HTML tags embedded in Markdown documents. By supplying a crafted Markdown file and inducing a victim to open it in the extension’s preview feature, an attacker can execute arbitrary JavaScript within the preview context, including execution through iframe-based content under the browser same-origin model used by the preview environment. This turns a Markdown preview action into an active script execution surface inside the developer workstation context.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Arbitrary JavaScript execution vulnerability in the VSCode Markdown Preview Enhanced extension due to unsafe rendering of HTML tags in Markdown preview, enabling data exfiltration and local port enumeration.
A vulnerability in the VS Code 'Markdown Preview Enhanced' extension that allows JavaScript execution, enabling local port scanning and data exfiltration; affects all versions.
Arbitrary JavaScript execution in the VS Code Markdown Preview Enhanced extension’s preview context, enabling local reconnaissance (e.g., port enumeration) and data exfiltration, potentially chainable depending on environment.
A vulnerability in the VS Code Markdown Preview Enhanced extension enabling JavaScript execution that can be leveraged for local port scanning and potential data exfiltration.
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.