PatchTheCVECVE-2020-7773: This affects the package markdown-it-highlightjs before 3.3.1
CVE-2020-7773 is a medium-severity flaw (CVSS 6.5) affecting markdown-it-highlightjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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);
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 1.4% (top 28%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2020-11-16 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-7773?
markdown-it-highlightjs: upgrade to 3.3.1. Exact commands for each OS are on this page.
Is CVE-2020-7773 being exploited?
CVE-2020-7773 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-7773 affect?
CVE-2020-7773 affects markdown-it-highlightjs. Severity is medium (CVSS 6.5). 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
How urgent is CVE-2020-7773?
Priority 46/100. Public exploit reference