CVE-2020-7773

MEDIUM

markdown-it-highlightjs <3.3.1 - XSS

Title source: llm
STIX 2.1

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

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