CVE-2026-54525
highMarkdown Preview Enhanced is a Markdown preview extension for Visual Studio Code.
Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.28, Markdown Preview Enhanced preview-link handling passes a decoded, Markdown-controlled link target to a Windows file-opening helper that invokes child_process.exec with the start command. When a Windows user opens an untrusted Markdown file and clicks a crafted external or unsupported-scheme link, shell metacharacters in the decoded target are interpreted by cmd.exe as command separators, allowing an attacker-selected command to run with the privileges of the current VS Code user. The attack requires one normal preview-link click but does not require malicious workspace configuration, script execution to be enabled, or additional files. This issue is fixed in version 0.8.28.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/shd101wyy/crossnote/commit/5588ca2121c3da43fe331575dc5cf4ef347b91ee security-advisories@github.com
- https://github.com/shd101wyy/crossnote/pull/442 security-advisories@github.com
- https://github.com/shd101wyy/crossnote/releases/tag/0.9.29 security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/dcd80281c986293b93d9f... security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2318 security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28 security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-7v6... security-advisories@github.com