CVE-2026-54703 (GCVE-0-2026-54703)
Vulnerability from cvelistv5
Published
2026-10-14 19:09
Modified
2026-10-15 14:21
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-73 - External Control of File Name or Path
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| shd101wyy | vscode-markdown-preview-enhanced |
Version: < 0.8.30 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-54703",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-15T14:18:41.174544Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-15T14:21:40.113Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "vscode-markdown-preview-enhanced",
"vendor": "shd101wyy",
"versions": [
{
"status": "affected",
"version": "\u003c 0.8.30"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 5.8,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-73",
"description": "CWE-73: External Control of File Name or Path",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-14T19:09:50.323Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42"
},
{
"name": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323"
},
{
"name": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e"
},
{
"name": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30"
}
],
"source": {
"advisory": "GHSA-82rc-7g3m-2c42",
"discovery": "UNKNOWN"
},
"title": "Markdown Preview Enhanced: Arbitrary File Write via updateMarkdown Command Without Path Validation"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54703",
"datePublished": "2026-10-14T19:09:50.323Z",
"dateReserved": "2026-06-15T22:58:06.563Z",
"dateUpdated": "2026-10-15T14:21:40.113Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"Markdown Preview Enhanced: Arbitrary File Write via updateMarkdown Command Without Path Validation\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-73\", \"lang\": \"en\", \"description\": \"CWE-73: External Control of File Name or Path\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV4_0\": {\"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"PASSIVE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"baseScore\": 5.8, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"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\", \"version\": \"4.0\"}}], \"references\": [{\"name\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42\"}, {\"name\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323\"}, {\"name\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e\"}, {\"name\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30\"}], \"affected\": [{\"vendor\": \"shd101wyy\", \"product\": \"vscode-markdown-preview-enhanced\", \"versions\": [{\"version\": \"\u003c 0.8.30\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-10-14T19:09:50.323Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s 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.\"}], \"source\": {\"advisory\": \"GHSA-82rc-7g3m-2c42\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-54703\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-15T14:18:41.174544Z\"}}}], \"references\": [{\"url\": \"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82rc-7g3m-2c42\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-15T14:18:58.883Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-54703\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-06-15T22:58:06.563Z\", \"datePublished\": \"2026-10-14T19:09:50.323Z\", \"dateUpdated\": \"2026-10-15T14:21:40.113Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…