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CVE-2020-7773

21
FAUCET Score

CVE-2020-7773 describes a cross-site scripting (XSS) vulnerability in the markdown-it-highlightjs package prior to version 3.3.1. An attacker can inject malicious JavaScript by manipulating the 'lang' value within the inline code highlighting feature. This medium-severity vulnerability has a CVSS score of 6.1, indicating a network-based attack requiring user interaction, with potential for low impact on confidentiality and integrity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.1CPE matchmatch criteria
cpe:2.3:a:markdown-it-highlightjs_project:markdown-it-highlightjs:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.35%
Probability of exploitation in next 30 days
EPSS Percentile
68.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0135 is in the 81st percentile among its peer group of 26,220 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: markdown-it-highlightjsFixed in: 3.3.1

Vendor Advisories (1)

npmGHSA-f246-xrrj-g8j6medium

Cross-site Scripting in markdown-it-highlightjs

Feb 10, 2022

References

github.com / valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52
Broken Link
github.com / valeriangalliat/markdown-it-highlightjs/pull/14
ExploitThird Party Advisory
snyk.io / vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461
MitigationThird Party Advisory