CVE-2026-50733: high-severity vulnerability in shd101wyy Markdown Preview Enhanced
Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 0.6%
exploitation probability
0.6%top 50% of all CVEs
observed exploitation
nono source reports it
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 <script type="WaveDrom"> 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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
shd101wyy · Markdown Preview EnhancedRelated CVEs — shd101wyy Markdown Preview Enhanced
In the same product, most dangerous first.
CVE-2026-49493HIGHMarkdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()EPSS 0.6%CVE-2026-49492HIGHMarkdown Preview Enhanced OS Command Injection in External File and Link OpeningEPSS 0.5%CVE-2026-11422HIGHMarkdown Preview Enhanced 0.8.x Code Injection via WaveDrom RenderingEPSS 0.2%