What’s Vulnerable › Vulnerabilities

CVE-2026-44401: Typemill CMS 2.x Persistent XSS via Markdown javascript URI

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-09-10
• Weakness: CWE-79

Description

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.

Affected products

• typemill: from 2.0.0 through 2.23.0

References

• https://github.com/sn0x-sharma/CVE-2026-44401
• https://github.com/typemill/typemill
• https://github.com/typemill/typemill/releases/tag/v2.23.0
• https://www.vulncheck.com/advisories/typemill-cms-2-x-persistent-xss-via-markdown-javascript-uri

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