---
id: CVE-2026-44401
title: >-
  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 unsanitiz…
summary: >-
  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 unsanitiz…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-08-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:44:57.447'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44401'
references:
  - url: 'https://github.com/sn0x-sharma/CVE-2026-44401'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/typemill/typemill'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/typemill/typemill/releases/tag/v2.23.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/typemill-cms-2-x-persistent-xss-via-markdown-javascript-uri
    label: disclosure@vulncheck.com
tags:
  - nvd
  - exploit-available
epss: 0.0032
epssPercentile: 0.22204
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/sn0x-sharma/CVE-2026-44401'
  checkedAt: '2026-09-25T08:20:57.616Z'
exploitAvailable: true
ingestedAt: '2026-09-10T21:05:53.595Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.