XSS in Typemill
CVE-2026-44401
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Typemill — versions 2.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/typemill/typemill (product)
- github.com/typemill/typemill/releases/tag/2.23.0 (patch)
- www.vulncheck.com/advisories/typemill-cms-2-x-persistent-xss-via-markdown-javas… (third-party-advisory)
- github.com/typemill/typemill/releases/tag/v2.23.0 (patch)
- github.com/sn0x-sharma/CVE-2026-44401 (technical-description)
Frequently asked questions
- What is CVE-2026-44401?
- CVE-2026-44401 is a medium-severity vulnerability in Typemill, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-08-10.
- How severe is CVE-2026-44401?
- Medium severity. CVSS v3 base score is 4.8 out of 10.
- Is CVE-2026-44401 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.