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.
CVE-2026-4329 is a high severity with CVSS 7.2 Stored Cross-Site Scripting issue affecting the Plugin Blackhole for Bad Bots. It affects Versions up to 3.8 and is fixed in 3.8.1.
Use the related hub and response guides to connect this CVE-2026-4329 report with patch validation, scanner checks, and site hardening work.
Open the grouped hub for related CVEs, affected ranges, severity mix, and patch coverage.
Check access, XML-RPC exposure, backup readiness, and monitoring after patching.
Use containment, evidence capture, remediation, and validation steps when exploit risk is high.
CVE-2026-4329 is tracked for the Plugin Blackhole for Bad Bots as high severity with CVSS 7.2. The affected range is Versions up to 3.8. Update Blackhole for Bad Bots to 3.8.1 or newer where that version is compatible with the site.
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This report has a CVE identifier, which makes it suitable for focused search and vulnerability triage workflows.
Affected version data gives operators a concrete comparison point against installed WordPress software.
A fixed version is present, so the page can answer update and remediation intent directly.
External references are available for source validation, advisory review, and incident notes.
Use these checks when converting this record into a patch ticket, incident note, or risk acceptance decision.
Inventory the installed Plugin package and compare its version with Versions up to 3.8.
Confirm Blackhole for Bad Bots is updated to 3.8.1 or newer.
Review references and CVSS vector details for exploitability, authentication requirements, and exposure path.
After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
blackhole-bad-bots
View on wordpress.org
|
| CVE | CVE-2026-4329 |
| Patched Versions |
3.8.1
|
| Affected Versions |
Versions up to 3.8
|
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