{"id":"CVE-2026-49492","state":"PUBLISHED","title":"Markdown Preview Enhanced OS Command Injection in External File and Link Opening","description":"Markdown Preview Enhanced before 0.8.28 opens external files and links from the preview through a shell and does not validate untrusted inputs taken from the markdown document - the diagram filename attribute, imported file paths, and the latex_engine code-chunk attribute. On Windows, a crafted markdown document can inject operating system commands that execute when the document is previewed. Fixed in 0.8.28 by passing these inputs as literal arguments instead of through a shell and validating them before use.","publishedAt":"2026-06-05T17:49:52.057Z","updatedAt":"2026-06-08T16:14:52.814Z","severity":{"score":8.6,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["shd101wyy Markdown Preview Enhanced"],"affected":[{"vendor":"shd101wyy","product":"Markdown Preview Enhanced","versions":[{"version":"0","status":"affected","lessThan":"0.8.28","versionType":"semver"}],"platforms":["Windows"]}],"references":["https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28","https://www.vulncheck.com/advisories/markdown-preview-enhanced-os-command-injection-in-external-file-and-link-opening"],"weaknesses":["CWE-78"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49492.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49492","state":"PUBLISHED","datePublished":"2026-06-05T17:49:52.057Z","dateUpdated":"2026-06-08T16:14:52.814Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-05-31T11:54:34.993Z"},"containers":{"cna":{"title":"Markdown Preview Enhanced OS Command Injection in External File and Link Opening","descriptions":[{"lang":"en","value":"Markdown Preview Enhanced before 0.8.28 opens external files and links from the preview through a shell and does not validate untrusted inputs taken from the markdown document - the diagram filename attribute, imported file paths, and the latex_engine code-chunk attribute. 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Fixed in 0.8.28 by passing these inputs as literal arguments instead of through a shell and validating them before use."}],"affected":[{"vendor":"shd101wyy","product":"Markdown Preview Enhanced","versions":[{"version":"0","status":"affected","lessThan":"0.8.28","versionType":"semver"}],"platforms":["Windows"]}],"references":[{"url":"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28","name":"Release 0.8.28","tags":["release-notes"]},{"url":"https://www.vulncheck.com/advisories/markdown-preview-enhanced-os-command-injection-in-external-file-and-link-opening","name":"VulnCheck Advisory: Markdown Preview Enhanced OS Command Injection in External File and Link Opening","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.6,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-06-05T17:49:52.057Z"},"datePublic":"2026-06-05T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:markdown_preview_enhanced_project:markdown_preview_enhanced:*:*:*:*:*:*:*:*","versionEndExcluding":"0.8.28"}]}]}],"credits":[{"lang":"en","value":"byte16384","type":"finder"}],"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-08T16:13:18.480118Z","id":"CVE-2026-49492","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-08T16:14:52.814Z"}}]}}}