What is CVE-2020-28455?

CVE-2020-28455 is a high-severity vulnerability in Markdown-It-Toc Project, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2022-07-25.

How severe is CVE-2020-28455?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Markdown-It-Toc Project

CVE-2020-28455

This affects all versions of package markdown-it-toc. The title of the generated toc and the contents of the header are not escaped.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-07-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Markdown-It-Toc Project
Markdown-It-Toc — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security.snyk.io/vuln/SNYK-JS-MARKDOWNITTOC-1044067 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28455?: CVE-2020-28455 is a high-severity vulnerability in Markdown-It-Toc Project, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2022-07-25.
How severe is CVE-2020-28455?: High severity. CVSS v3 base score is 7.3 out of 10.