CVE-2018-5773: markdown2 is vulnerable to cross-site scripting
(updated )
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.
References
- github.com/advisories/GHSA-p6h9-gw49-rqm4
- github.com/google/osv/issues/430
- github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2018-13.yaml
- github.com/trentm/python-markdown2
- github.com/trentm/python-markdown2/blob/master/CHANGES.md
- github.com/trentm/python-markdown2/commit/1b1dcdd727c0ef03453b9f5ef5ae3679f1d72323
- github.com/trentm/python-markdown2/issues/285
- github.com/trentm/python-markdown2/pull/303
- nvd.nist.gov/vuln/detail/CVE-2018-5773
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