Referer Spam Blocker Security & Risk Analysis

wordpress.org/plugins/referer-spam-blocker

Block/blacklist known (and custom) spam referring domains at the WordPress level with an HTTP 403 Forbidden page.

80 active installs v0.4 PHP + WP 4.2+ Updated Unknown
blockdomainrefererreferer-spamspam
100
A · Safe
CVEs total0
Unpatched0
Last CVENever
Download
Safety Verdict

Is Referer Spam Blocker Safe to Use in 2026?

Generally Safe

Score 100/100

Referer Spam Blocker has no known CVEs and is actively maintained. It's a solid choice for most WordPress installations.

No known CVEs
Risk Assessment

Based on the provided static analysis and vulnerability history, the "referer-spam-blocker" plugin v0.4 exhibits a very strong security posture. The analysis reveals an exceptionally clean codebase with no identified dangerous functions, no direct SQL queries (all prepared statements), and complete output escaping. Furthermore, there are no file operations or external HTTP requests, minimizing potential attack vectors.

The absence of any identified CVEs, past or present, coupled with the clean code signals, suggests a proactive and secure development approach for this version. The plugin also appears to have a minimal attack surface, with zero AJAX handlers, REST API routes, shortcodes, or cron events, all of which are reported as unprotected. This lack of entry points significantly reduces the opportunities for attackers.

While the plugin's current state is highly commendable and demonstrates excellent security practices, the complete lack of capability checks and nonce checks on its (hypothetical) entry points, if they were to exist, could be a minor concern in scenarios where functionality might be added in future versions without proper security considerations. However, given the current zero attack surface, this is purely a theoretical point. In its current state, the plugin appears to be extremely secure.

Key Concerns

  • No nonce checks on entry points
  • No capability checks on entry points
Vulnerabilities
None known

Referer Spam Blocker Security Vulnerabilities

No known vulnerabilities — this is a good sign.
Code Analysis
Analyzed Mar 16, 2026

Referer Spam Blocker Code Analysis

Dangerous Functions
0
Raw SQL Queries
0
0 prepared
Unescaped Output
0
14 escaped
Nonce Checks
0
Capability Checks
0
File Operations
0
External Requests
0
Bundled Libraries
0

Output Escaping

100% escaped14 total outputs
Attack Surface

Referer Spam Blocker Attack Surface

Entry Points0
Unprotected0
Maintenance & Trust

Referer Spam Blocker Maintenance & Trust

Maintenance Signals

WordPress version tested
Last updatedUnknown
PHP min version
Downloads3K

Community Trust

Rating60/100
Number of ratings2
Active installs80
Developer Profile

Referer Spam Blocker Developer Profile

WP Maintainer

2 plugins · 90 total installs

89
trust score
Avg Security Score
93/100
Avg Patch Time
30 days
View full developer profile
Detection Fingerprints

How We Detect Referer Spam Blocker

Patterns used to identify this plugin on WordPress sites during automated security audits and web crawling.

Asset Fingerprints

Asset Paths
/wp-content/plugins/referer-spam-blocker/includes/css/admin-style.css/wp-content/plugins/referer-spam-blocker/includes/js/admin-script.js
Script Paths
/wp-content/plugins/referer-spam-blocker/includes/js/admin-script.js
Version Parameters
/wp-content/plugins/referer-spam-blocker/includes/css/admin-style.css?ver=/wp-content/plugins/referer-spam-blocker/includes/js/admin-script.js?ver=

HTML / DOM Fingerprints

FAQ

Frequently Asked Questions about Referer Spam Blocker