Is CVE-2026-54525 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-54525 being exploited in the wild.

How severe is CVE-2026-54525?

High severity, with a CVSS score of 8.8, published 14 October 2026.

Which products and versions are affected?

Shd101wyy Markdown Preview Enhanced prior to 0.8.28.

How is CVE-2026-54525 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-54525?

Check whether you run Shd101wyy Markdown Preview Enhanced at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54525: Markdown Preview Enhanced command injection in preview links on Windows

CVE-2026-54525 · Severity: high · CVSS 8.8 · Published 2026-10-14

Markdown Preview Enhanced is a Visual Studio Code extension that renders Markdown files with rich previews. On Windows systems, clicking a crafted link in an untrusted Markdown file allows an attacker to execute arbitrary commands with the privileges of the current VS Code user. The attack requires only a single click and no additional setup or configuration.

Technologies: Shd101wyy Markdown Preview Enhanced. Vendors: Shd101wyy.

Quick answers

Is CVE-2026-54525 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-54525 being exploited in the wild.
How severe is CVE-2026-54525?: High severity, with a CVSS score of 8.8, published 14 October 2026.
Which products and versions are affected?: Shd101wyy Markdown Preview Enhanced prior to 0.8.28.
Is there a fix for CVE-2026-54525?: Yes: fixed in 0.8.28. Until then: Avoid opening untrusted or unfamiliar Markdown files in Visual Studio Code until the extension is updated. Users on non-Windows systems are not affected by this particular vulnerability. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54525 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-54525?: Check whether you run Shd101wyy Markdown Preview Enhanced at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.8.28

Avoid opening untrusted or unfamiliar Markdown files in Visual Studio Code until the extension is updated. Users on non-Windows systems are not affected by this particular vulnerability.

Technical details

The vulnerability exists in the preview-link handling code, which uses child_process.exec() with the Windows start command to open external links. The link target is URL-decoded but not sanitized before being passed to the shell, allowing shell metacharacters (such as &) to be interpreted as command separators by cmd.exe. An attacker can craft a Markdown link like [x](mailto:a%26%20calc.exe) that decodes to mailto:a& calc.exe, causing cmd.exe to execute calc.exe as a second command. The fix replaces shell execution with execFile('explorer.exe', [target]) which treats the target as a single unsanitized argument.

Affected products

shd101wyy Markdown Preview Enhanced prior to 0.8.28

Timeline

2026-10-14: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.