CVE-2026-49493 — Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbit…
Published: 2026-06-05 · CVSS: 8.6 · CVSS 4.0
Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled code on the server side when the document is rendered or exported. Fixed in 0.8.28 by parsing bitfield register definitions with JSON5.parse(), since they are purely data.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7