High
Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()
Type: advisorySources: OSV
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
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-50733
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 21:18 UTC · Revision 1
Source evidence
Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()
core-osv · Original sourcePublished 5 Jun 2026, 17:49 UTC
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
osv:CVE-2026-50733
Complete source record
{
"id": "f1d76c233f8ed615635e024d93fc1b5d7920b6501586b72b707d4f0622d2075f",
"url": "https://osv.dev/vulnerability/CVE-2026-50733",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()",
"summary": "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",
"evidence": "osv:CVE-2026-50733",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-50733",
"aliases": [
"CVE-2026-50733"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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": [
{
"ranges": [
{
"repo": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "dcd80281c986293b93d9f1af34ced64dcb230c77"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.8.28"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "dcd80281c986293b93d9f1af34ced64dcb230c77"
}
],
"source": "REFERENCES_TAG",
"original_tag": "0.8.28"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.8.28"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"0.8.27",
"0.8.26",
"0.8.25",
"0.8.24",
"0.8.23",
"0.8.21",
"0.8.20",
"0.8.19",
"0.8.18",
"0.8.17",
"0.8.16",
"0.8.15",
"0.8.14",
"0.8.13",
"0.8.12",
"0.8.11",
"0.8.10",
"0.8.9",
"0.8.8",
"0.8.7",
"0.8.6",
"0.8.5",
"0.8.4",
"0.8.3",
"0.8.2",
"0.8.1",
"0.8.0",
"0.7.10",
"0.7.9",
"0.7.8",
"0.7.7",
"v0.7.6",
"v0.7.5",
"v0.7.4",
"v0.7.3",
"v0.7.2",
"v0.7.1",
"v0.7.0",
"v0.6.10",
"v0.6.8",
"v0.6.7",
"v0.6.6",
"v0.6.5",
"v0.6.3",
"v0.6.2",
"v0.6.1",
"v0.6.0",
"v0.5.22",
"v0.5.21",
"v0.5.20",
"v0.5.18",
"v0.5.17",
"v0.5.16",
"v0.5.15",
"v0.5.14",
"v0.5.13",
"v0.5.12",
"v0.5.11",
"v0.5.10",
"v0.5.9",
"v0.5.8",
"v0.5.4",
"v0.5.3",
"v0.5.2",
"v0.5.1",
"0.5.1",
"0.5.0",
"v0.4.3",
"0.4.3",
"v0.4.2",
"0.4.2",
"v0.4.1",
"0.4.1",
"0.4.0",
"v0.3.13",
"0.3.13",
"v0.3.12",
"0.3.12",
"0.3.11",
"0.3.10",
"0.3.9",
"0.3.8",
"0.3.7",
"0.3.6",
"0.3.5",
"0.3.4",
"0.3.3",
"0.3.2",
"0.3.1",
"0.3.0",
"0.2.9",
"0.2.8",
"0.2.7",
"0.2.6",
"0.2.5",
"0.2.4",
"0.2.3",
"0.2.2",
"0.2.1",
"0.2.0",
"0.1.9",
"0.1.8",
"0.1.7",
"0.1.6",
"0.1.5",
"0.1.4",
"0.1.3",
"0.1.2",
"0.1.1",
"0.1.0",
"0.0.9",
"0.0.8"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50733.json"
}
}
],
"modified": "2026-10-28T02:30:39.825608030Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50733.json",
"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28",
"https://nvd.nist.gov/vuln/detail/CVE-2026-50733",
"https://www.vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-wavedrom-eval",
"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315"
],
"provider_metadata": {
"cwe_ids": [
"CWE-95"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50733.json"
}
},
"related_cves": [
{
"value": "CVE-2026-50733",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 507145,
"published_at": "2026-06-05T17:49:53.631+00:00"
}