CVE-2026-49493
Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
CVSS Score
8.8
EPSS Score
0.1%
EPSS Percentile
21th
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.
| CWE | CWE-94 |
| Vendor | shd101wyy |
| Product | markdown preview enhanced |
| Published | Jun 5, 2026 |
| Last Updated | Jun 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
shd101wyy / Markdown Preview Enhanced
0 < 0.8.28