CVE-2026-50733

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Source
https://cve.org/CVERecord?id=CVE-2026-50733
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50733.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-50733
Published
2026-06-05T17:49:53.631Z
Modified
2026-07-08T08:05:22.487816663Z
Severity
  • 8.6 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50733.json",
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-95"
    ]
}
References

Affected packages

Git / github.com/shd101wyy/vscode-markdown-preview-enhanced

Affected ranges

Type
GIT
Repo
https://github.com/shd101wyy/vscode-markdown-preview-enhanced
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
dcd80281c986293b93d9f1af34ced64dcb230c77
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.8.28"
        }
    ]
}

Affected versions

0.*
0.0.8
0.0.9
0.1.0
0.1.1
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.2.7
0.2.8
0.2.9
0.3.0
0.3.1
0.3.10
0.3.11
0.3.12
0.3.13
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.5.0
0.5.1
0.7.10
0.7.7
0.7.8
0.7.9
0.8.0
0.8.1
0.8.10
0.8.11
0.8.12
0.8.13
0.8.14
0.8.15
0.8.16
0.8.17
0.8.18
0.8.19
0.8.2
0.8.20
0.8.21
0.8.23
0.8.24
0.8.25
0.8.26
0.8.27
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
v0.*
v0.3.12
v0.3.13
v0.4.1
v0.4.2
v0.4.3
v0.5.1
v0.5.10
v0.5.11
v0.5.12
v0.5.13
v0.5.14
v0.5.15
v0.5.16
v0.5.17
v0.5.18
v0.5.2
v0.5.20
v0.5.21
v0.5.22
v0.5.3
v0.5.4
v0.5.8
v0.5.9
v0.6.0
v0.6.1
v0.6.10
v0.6.2
v0.6.3
v0.6.5
v0.6.6
v0.6.7
v0.6.8
v0.7.0
v0.7.1
v0.7.2
v0.7.3
v0.7.4
v0.7.5
v0.7.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50733.json"