Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXA2aDktZ3c0OS1ycW00

markdown2 is vulnerable to cross-site scripting

An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final > character from an IMG tag.

Permalink: https://github.com/advisories/GHSA-p6h9-gw49-rqm4
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXA2aDktZ3c0OS1ycW00
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 6 years ago
Updated: 3 months ago

CVSS Score: 6.1
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Percentage: 0.00063
EPSS Percentile: 0.29423

Identifiers: GHSA-p6h9-gw49-rqm4, CVE-2018-5773
References:

• https://nvd.nist.gov/vuln/detail/CVE-2018-5773
• https://github.com/trentm/python-markdown2/issues/285
• https://github.com/advisories/GHSA-p6h9-gw49-rqm4
• https://github.com/google/osv/issues/430
• https://github.com/trentm/python-markdown2/pull/303
• https://github.com/trentm/python-markdown2/blob/master/CHANGES.md#python-markdown2-236
• https://github.com/trentm/python-markdown2/commit/1b1dcdd727c0ef03453b9f5ef5ae3679f1d72323
• https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2018-13.yaml

Repository: https://github.com/trentm/python-markdown2
Blast Radius: 22.0

Affected Packages