Cross-site scripting in markdown2 for python

published 2020-01-15 6 y ago modified 2026-06-16 4 mo ago also GHSA-72cx-5ff9-4hhc , PYSEC-2020-235 , EUVD-2020-0104

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

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

Patch / fix

fixed in 2 links 1

pypi markdown2 1.0.1.14
python-markdown2_project python-markdown2 1.0.1.14

openwall.com/lists/oss-security/2009/10/29/5 advisory

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

openwall.com https://www.openwall.com/lists/oss-security/2009/10/29/5 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	markdown2	<1.0.1.14	1.0.1.14

Affected products

python-markdown2 python-markdown2

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

openwall.com /lists/oss-security/2009/10/29/5
web, exploit, mailing-list, patch, third-party-advisory
snyk.io /vuln/SNYK-PYTHON-PYRAD-40000
web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2009-3724
advisory
github.com /advisories/GHSA-72cx-5ff9-4hhc
advisory
github.com /pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2020-235.yaml
web
github.com /trentm/python-markdown2
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary