--- title: "CVE-2026-54566: Markdown Preview Enhanced - Command Injection" description: "Markdown Preview Enhanced < 0.8.29 contains a command injection caused by unsafe evaluation of repository-controlled .crossnote/config.js and .crossnote/parser.js files with vm.runInNewContext, letting attackers execute OS commands as the victim user, exploit requires opening a Markdown file in a malicious repository." url: https://panop.io/threat-heartbeat/CVE-2026-54566/ --- # CVE-2026-54566 Markdown Preview Enhanced - Command Injection Markdown Preview Enhanced < 0.8.29 contains a command injection caused by unsafe evaluation of repository-controlled .crossnote/config.js and .crossnote/parser.js files with vm.runInNewContext, letting attackers execute OS commands as the victim user, exploit requires opening a Markdown file in a malicious repository. CVSS base score 8.5 /10 High CISA KEV Not listed Public exploit None known Authentication Not required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-54566) ## Details Type Command Injection Impact Remote Code Execution CVSS vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 14 October 2026 Updated 15 October 2026 Weakness [CWE-94](https://cwe.mitre.org/data/definitions/94.html) ## Vendor fix Update to version 0.8.29 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-54566](https://nvd.nist.gov/vuln/detail/CVE-2026-54566) - [https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2320](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2320) - [https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.29](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.29) - [https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-427h-jhpr-8jch](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-427h-jhpr-8jch) - [https://github.com/shd101wyy/crossnote/commit/e4890d64502e53b717cce0cb73f1a78b244dc640](https://github.com/shd101wyy/crossnote/commit/e4890d64502e53b717cce0cb73f1a78b244dc640) - [https://github.com/shd101wyy/crossnote/pull/443](https://github.com/shd101wyy/crossnote/pull/443) - [https://github.com/shd101wyy/crossnote/releases/tag/0.9.30](https://github.com/shd101wyy/crossnote/releases/tag/0.9.30) - [https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/0d4010988c6ae56a38c6dec4a7509cbd5a7dcb4c](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/0d4010988c6ae56a38c6dec4a7509cbd5a7dcb4c) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)