The Blackhole for Bad Bots plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the User-Agent HTTP header in all versions up to and including 3.8. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() when capturing bot data (which strips HTML tags but does not escape HTML entities like double quotes), then stores the data via update_option(). When an administrator views the Bad Bots log page, the stored data is output directly into HTML input value attributes (lines 75-83) without esc_attr() and into HTML span content without esc_html(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the Blackhole Bad Bots admin page.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Blackhole Bad Bots Plugin | — | Update blackhole-bad-bots plugin to version 3.8.1, or a newer patched version | Apr 30, 2026 | Mar 25, 2026 |
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