What’s Vulnerable › Vulnerabilities

CVE-2026-46492: md-fileserver: Stored/Reflected XSS when viewing Markdown (raw HTML allowed)

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-09 · updated 2026-08-12
• Weakness: CWE-80

Description

md-fileserver allows for local viewing of markdown files in a browser. Prior to version 1.10.3, a cross-site scripting (XSS) vulnerability exists in the application’s Markdown rendering logic. When user-supplied Markdown content is rendered, embedded raw HTML—including <script> tags—is processed and injected into the resulting page without sanitization, allowing arbitrary JavaScript execution in the context of the affected domain. This issue has been patched in version 1.10.3.

Affected products

• commenthol md-fileserver: before 1.10.3 — fixed in 1.10.3

How to fix

Upgrade to a fixed version: commenthol md-fileserver 1.10.3. Check the vendor advisory for mitigations.

References

• https://github.com/commenthol/md-fileserver/releases/tag/v1.10.3
• https://github.com/commenthol/md-fileserver/security/advisories/GHSA-32q2-hhr5-6qvv
• https://github.com/commenthol/md-fileserver/security/advisories/GHSA-32q2-hhr5-6qvv

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