🛡️ CVE-2026-50733
🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-95 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval(), allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview (window.eval) and presentation mode plus HTML export (the bundled WaveDrom.ProcessAll()/eva() helpers) - and can also be triggered through a element injected via raw HTML in markdown. When a victim previews or exports a crafted markdown document, an attacker can execute arbitrary code, leading to arbitrary file write. Fixed in 0.8.28 by parsing with JSON5.parse() and sanitizing WaveDrom data scripts to inert strict JSON.

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-95
Public Exploit ✅ No
Source NVD
Published 2026-06-05
Updated 2026-06-06
Modified 2026-06-05
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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