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.
github.com/advisories/GHSA-p6h9-gw49-rqm4
github.com/google/osv/issues/430
github.com/trentm/python-markdown2
github.com/trentm/python-markdown2/blob/master/CHANGES.md#python-markdown2-236
github.com/trentm/python-markdown2/issues/285
github.com/trentm/python-markdown2/pull/303
nvd.nist.gov/vuln/detail/CVE-2018-5773