# CVE-2020-11888: XSS in python-markdown2

Source: https://junglewise.ai/threats/cve-2020-11888-xss-in-python-markdown2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-04-20  
License: CC BY 4.0 with a link back

CVE-2020-11888 · Severity: low · CVSS 3.1 · Published 2020-04-20

python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds. For example, an attack might use elementname@ or elementname- with an onclick attribute.

Technologies: [markdown2 (PyPI)](https://junglewise.ai/threats/technologies/markdown2). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2020-11888 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-11888 being exploited in the wild.

**How severe is CVE-2020-11888?** Low severity, with a CVSS score of 3.1, published 20 April 2020.

**Which products and versions are affected?** markdown2 (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.9.

**Is there a fix for CVE-2020-11888?** Yes. markdown2 (PyPI): upgrade to 2.3.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-11888?** Check whether you run markdown2 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- markdown2 (PyPI): upgrade to 2.3.9 or later

  ```sh
  pip install "markdown2>=2.3.9"
  ```


## Affected products

- markdown2 (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.9

## Identifiers

- CVE-2020-11888
- GHSA-fv3h-8x5j-pvgq
- PYSEC-2020-65

## Related threats

- [markdown2 Regular Expression Denial of Service](https://junglewise.ai/threats/cve-2021-26813-markdown2-regular-expression-denial-of-service)
- [PYSEC-2020-235 - python-markdown2 before 1.0.1.14 has multiple cross-site scripting (XSS) issues.](https://junglewise.ai/threats/cve-2009-3724-cross-site-scripting-in-markdown2-for-python)
- [markdown2 is vulnerable to cross-site scripting](https://junglewise.ai/threats/cve-2018-5773-markdown2-is-vulnerable-to-cross-site-scripting)