What is CVE-2009-3724?

CVE-2009-3724 is a medium-severity vulnerability in Python-Markdown2, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-15.

How severe is CVE-2009-3724?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Python-Markdown2

CVE-2009-3724

python-markdown2 before 1.0.1.14 has multiple cross-site scripting (XSS) issues.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-01-15 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Python-Markdown2 — versions before 1.0.1.14
Python-Markdown2 Project

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.openwall.com/lists/oss-security/2009/10/29/5 (Exploit, Patch, Mailing List, Third Party Advisory)
snyk.io/vuln/SNYK-PYTHON-PYRAD-40000 (Third Party Advisory)

Frequently asked questions

What is CVE-2009-3724?: CVE-2009-3724 is a medium-severity vulnerability in Python-Markdown2, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-15.
How severe is CVE-2009-3724?: Medium severity. CVSS v3 base score is 6.1 out of 10.