Medium severity6.5NVD Advisory· Published Nov 16, 2020· Updated Jun 17, 2026
CVE-2020-7773
CVE-2020-7773
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);
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
markdown-it-highlightjsnpm | < 3.3.1 | 3.3.1 |
Affected products
3- markdown-it-highlightjs/markdown-it-highlightjsdescription
- cpe:2.3:a:markdown-it-highlightjs_project:markdown-it-highlightjs:*:*:*:*:*:node.js:*:*Range: <3.3.1
Patches
Vulnerability mechanics
References
5- github.com/valeriangalliat/markdown-it-highlightjs/pull/14nvdExploitThird Party AdvisoryWEB
- github.com/advisories/GHSA-f246-xrrj-g8j6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-7773ghsaADVISORY
- snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461nvdMitigationThird Party AdvisoryWEB
- github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52nvdBroken LinkWEB
News mentions
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