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CVE-2020-7773
Cross-site Scripting (XSS)
Medium6.5EPSS 1.4%
- Published
- Updated
- Reserved
- Assigned by
- snyk
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);
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| snykCNA (assigner) | 3.1 | Medium6.5 | 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 |
| NVDNVD · Modified | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (6 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
- Cross-site Scripting (XSS)
- CWE-79 (opens in a new tab)All about CWE-79 and its CVEs
Affected products
markdown-it-highlightjs
- affected unspecified – < 3.3.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmmarkdown-it-highlightjsGHSA-f246-xrrj-g8j6 (opens in a new tab)
References (3)
- https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-f246-xrrj-g8j6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-7773)Record last updated .