CVE-2026-54703

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Source
https://cve.org/CVERecord?id=CVE-2026-54703
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54703.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54703
Aliases
  • GHSA-82rc-7g3m-2c42
Published
2026-10-14T19:09:50Z
Modified
2026-10-15T10:47:31Z
Severity
  • 5.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Markdown Preview Enhanced: Arbitrary File Write via updateMarkdown Command Without Path Validation
Details

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, the _crossnote.updateMarkdown command in Markdown Preview Enhanced accepts an arbitrary URI and attacker-controlled content, then passes them to vscode.workspace.fs.writeFile without validating that the target is the Markdown file represented by the current preview. JavaScript already executing in the preview webview can invoke this command through the extension message bridge and write any file permitted by the VS Code user's operating-system privileges, including user configuration, startup, source, and build files. This file-write vulnerability requires a separate webview JavaScript execution path, such as the independently tracked head.html injection and blind command-dispatch weaknesses. This issue is fixed in version 0.8.30.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-73"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54703.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-2026-54703.json"