Blackhole for Bad Bots <= 3.8 - Unauthenticated Stored Cross-Site Scripting via User-Agent HTTP Header

Wordfence Intelligence > Vulnerability Database > Blackhole for Bad Bots <= 3.8 - Unauthenticated Stored Cross-Site Scripting via User-Agent HTTP Header

7.2

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVE	CVE-2026-4329
CVSS	7.2 (High)
Publicly Published	March 25, 2026
Last Updated	March 26, 2026
Researcher	Luc Huynh from Noventiq RedTeam - Noventiq Vietnam

Description

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.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

Vulnerability Details for Blackhole for Bad Bots

Blackhole for Bad Bots

Software Type	Plugin
Software Slug	blackhole-bad-bots (view on wordpress.org)
Patched?	Yes
Remediation	Update to version 3.8.1, or a newer patched version
Affected Version	<= 3.8
Patched Version	3.8.1

Recent vulnerabilities in Blackhole for Bad Bots

Blackhole for Bad Bots <= 3.3.1 - Arbitrary IP Address Blocking via IP Spoofing

9.1

CVE-2022-1165

Jan 31, 2022

Researcher: Daniel Ruf

#	Title	CVE ID	CVSS	Researchers	Date
1	Blackhole for Bad Bots <= 3.3.1 - Arbitrary IP Address Blocking via IP Spoofing	CVE-2022-1165	9.1	Daniel Ruf	January 31, 2022

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