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);
References (3)
Core 3
Core References
Mitigation, Third Party Advisory x_refsource_misc
https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461
Exploit, Third Party Advisory x_refsource_misc
https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14
Broken Link x_refsource_misc
https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52
Scores
CVSS v3
6.5
EPSS
0.0135
EPSS Percentile
68.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Details
CWE
CWE-79
Status
published
Products (2)
markdown-it-highlightjs_project/markdown-it-highlightjs
< 3.3.1
npm/markdown-it-highlightjs
0 - 3.3.1npm
Published
Nov 16, 2020
Tracked Since
Feb 18, 2026