CVE-2026-54702

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Source
https://cve.org/CVERecord?id=CVE-2026-54702
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54702.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54702
Aliases
  • GHSA-83c6-hcjv-pvmg
Published
2026-10-14T19:13:58Z
Modified
2026-10-15T10:47:31Z
Severity
  • 7.3 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Markdown Preview Enhanced: Blind Command Dispatch via Unvalidated Webview Message Handler
Details

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, the webview message handler in src/preview-provider.ts accepts an attacker-controlled command value and attacker-controlled args, constructs a command in the _crossnote namespace, and invokes vscode.commands.executeCommand without an allowlist or type validation. JavaScript already executing in the preview webview can use this bridge to invoke privileged extension commands, including file modification, code-chunk execution, export-tool execution, and arbitrary URL opening, with attacker-selected arguments. Exploitation requires a separate webview JavaScript execution path, such as the independently tracked .crossnote/head.html injection, but no further authorization check protects the extension-host command boundary. This issue is fixed in version 0.8.30.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-749"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54702.json"
}
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
8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.8.30"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

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
0.8.28
0.8.29
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-2026-54702.json"