Arbitrary JavaScript Execution in Markdown Preview Enhanced WaveDrom Rendering
CVE-2026-50733 affects Markdown Preview Enhanced before 0.8.28. The vulnerability is caused by unsafe evaluation of untrusted markdown-supplied WaveDrom diagram content using eval(). According to the provided content, all rendering paths are affected: live preview via window.eval, presentation mode, and HTML export through bundled WaveDrom.ProcessAll()/eva() helpers. The issue can also be triggered by injecting a <script type="WaveDrom"> element through raw HTML embedded in markdown. When a victim previews or exports a crafted markdown document, attacker-controlled JavaScript is executed in the application context. The vendor fixed the issue in 0.8.28 by replacing eval()-based parsing with JSON5.parse() and sanitizing WaveDrom data scripts into inert strict JSON.
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.