CVE-2026-44401 PUBLISHED

Typemill CMS 2.x Persistent XSS via Markdown javascript URI

Assigner: VulnCheck
Reserved: 05.05.2026 Published: 10.08.2026 Updated: 10.08.2026

Typemill CMS version 2.x contains a persistent cross-site scripting vulnerability in the Markdown parser extension that allows authenticated users with theme-configuration access to inject malicious JavaScript URIs by supplying unsanitized href values in Markdown links. Attackers can craft Markdown links using the javascript: scheme through ParsedownExtension.php or TwigMarkdownExtension.php, storing a persistent payload that executes in the browser of every visitor who clicks the link, enabling session cookie theft, authenticated request forgery, and credential harvesting.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
CVSS Score: 4.6

Product Status

Vendor Typemill
Product Typemill
Versions Default: affected
  • affected from 2.0.0 to 2.23.0 (incl.)

Credits

  • Sanket Sharma finder

References

Problem Types

  • Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE