WordPress Security Risks: A Deep Dive into Plugin & Site Vulnerabilities

As security researchers at Heypulso.com, we constantly monitor the digital landscape to identify emerging threats and common vulnerabilities. Our recent comprehensive scan, encompassing 43,960 domains, has provided invaluable insights into the current state of web security, with a particular focus on the pervasive WordPress ecosystem. This report zeroes in on the significant security risks posed by WordPress plugins, themes, and general site maintenance practices, backed by concrete data from our scanner.

WordPress powers a substantial portion of the internet, making it a prime target for attackers. While its flexibility and vast plugin/theme ecosystem are strengths, they also introduce a complex attack surface. Our findings highlight widespread vulnerabilities that demand immediate attention from site owners and developers.

The WordPress Landscape: A Snapshot from Our Scanner

Out of the 43,960 domains we scanned, a staggering 10,984 (25%) were identified as WordPress sites. This prevalence underscores WordPress’s dominance and, consequently, the critical importance of securing these installations.

Beyond WordPress-specific data, our general scan revealed a foundational security concern: across all 43,960 domains, only 53.9% (23,701) had valid SSL certificates. While this isn’t WordPress-exclusive, it indicates a broader neglect of basic security hygiene, leaving a significant portion of the internet susceptible to man-in-the-middle attacks and eroding user trust.

We also noted an average response time of 1346ms across the scanned domains. While not a direct security vulnerability, slow response times can indicate underlying performance issues, potentially exacerbated by unoptimized plugins, resource exhaustion, or even DDoS attempts, indirectly impacting a site’s resilience and user experience.

Critical Security Header Gaps on WordPress Sites

Our scan specifically audited the implementation of crucial security headers on the identified WordPress sites. The results are concerning, revealing a widespread lack of fundamental protections:

• 82.9% are missing X-Frame-Options: This header prevents clickjacking attacks by controlling whether a browser can render a page in a <frame>, <iframe>, or <object>. Its absence leaves sites vulnerable to malicious embedding.
• 88.1% are missing Content Security Policy (CSP): CSP is a powerful defense against cross-site scripting (XSS) and other code injection attacks. By defining trusted sources of content, CSP significantly limits the impact of potential vulnerabilities. Its near-total absence is a critical red flag.
• 77.9% are missing HSTS (HTTP Strict Transport Security): HSTS forces browsers to interact with a site only over HTTPS, preventing downgrade attacks and cookie hijacking. Without it, users remain vulnerable to initial HTTP connections.
• 49.9% have XML-RPC exposed: XML-RPC is a feature often enabled by default in WordPress, primarily used for remote publishing. However, it’s a known vector for brute-force attacks and DDoS. Nearly half of the WordPress sites we scanned have this potential attack surface wide open.

These figures paint a grim picture: the vast majority of WordPress sites are failing to implement basic, yet highly effective, security measures, leaving them exposed to a wide array of common web attacks.

The Plugin Predicament: Popularity vs. Prudence

WordPress plugins are the backbone of its functionality, but they are also frequently the weakest link in a site’s security chain. Our scanner identified the most commonly used plugins, many of which have historically been targeted by attackers due to their widespread adoption. While we don’t have specific vulnerability data for these exact versions, their prevalence means any discovered vulnerability can have a massive impact.

Here are the top 10 most common plugins identified across the 10,984 WordPress sites:

Rank	Plugin Name	Count
1	Contact Form 7	3152
2	Elementor	3070
3	Elementor Pro	1783
4	Revslider	1055
5	Complianz Gdpr	1033
6	Cookie Notice	852
7	Woocommerce	837
8	Wp Rocket	748
9	Js_composer	726
10	Pojo Accessibility	661

Table 1: Top 10 Most Common WordPress Plugins from Heypulso.com Scan

Plugins like Contact Form 7, Elementor, and WooCommerce are essential for many businesses, yet their popularity makes them high-value targets. A single unpatched vulnerability in any of these widely-used plugins could expose thousands of sites. For instance, Revolution Slider (Revslider), appearing at number 4 with 1055 installations, has a well-documented history of critical vulnerabilities that led to widespread compromises in the past. While current versions are likely patched, the sheer number of installations means that outdated versions could still be a significant risk.

Theme Traps: A Silent Contributor to Vulnerabilities

While plugins often get the spotlight for security issues, themes can also introduce significant risks, especially those that bundle their own plugins or include complex functionalities. Our scan revealed the following top themes:

• hello-elementor (1059)
• Divi (951)
• astra (611)
• twentyseventeen (287)
• oceanwp (201)

Themes like Divi and OceanWP are highly functional and popular, but their complexity can sometimes hide vulnerabilities or lead to conflicts with other plugins, creating security gaps. Keeping themes updated and choosing reputable developers are crucial steps in mitigating these risks.

WordPress Site Maintenance: A Grading Report

To provide a holistic view of site health, we graded the 10,984 WordPress sites based on their overall maintenance practices. The results are alarming, indicating a widespread lack of proper upkeep:

• A (80-100): 57 sites (0.5%) - Excellent maintenance, minimal identified risks.
• B (60-79): 4096 sites (37.3%) - Good maintenance, some areas for improvement.
• C (40-59): 5561 sites (50.6%) - Average maintenance, significant security gaps and outdated components likely.
• D (20-39): 1169 sites (10.6%) - Poor maintenance, high risk of compromise.
• F (0-19): 101 sites (0.9%) - Extremely poor maintenance, critical vulnerabilities likely.

Figure 1: WordPress Maintenance Grade Distribution

More than half of the WordPress sites (50.6%) received a ‘C’ grade, indicating average maintenance at best, with likely significant security gaps. Even more concerning, 11.5% (10.6% D + 0.9% F) are operating with critically poor maintenance. These sites are low-hanging fruit for attackers, likely running outdated software, unpatched plugins, and misconfigured settings, making them highly susceptible to compromise.

Geographic Distribution and Emerging Threats

Our scan covered domains across various geographies, with the highest concentrations found in:

• FR (France): 18,709 domains
• CL (Chile): 8,743 domains
• US (United States): 1,247 domains
• ES (Spain): 618 domains
• DE (Germany): 281 domains

This distribution highlights that security challenges are global, and no region is immune to the risks posed by unpatched software and poor practices.

Furthermore, our scanner identified 238 phishing sites within the scanned dataset. While not exclusively WordPress, compromised WordPress sites, often due to plugin vulnerabilities or weak credentials, are frequently leveraged for such malicious activities. These findings underscore the real-world impact of poor security, where seemingly minor vulnerabilities can lead to significant cybercrime.

Recommendations for a More Secure WordPress

The data from our scan clearly indicates an urgent need for improved security practices across the WordPress ecosystem. Here are key recommendations:

1. Regular Updates: Keep WordPress core, all plugins, and themes updated to their latest versions. This is the single most effective defense against known vulnerabilities.
2. Implement Security Headers: Configure X-Frame-Options, Content Security Policy (CSP), and HSTS. These headers provide crucial client-side protection against common attack vectors. Tools and plugins are available to assist with this.
3. Disable XML-RPC: If you don’t use remote publishing, disable XML-RPC. If you need it, ensure it’s protected with strong authentication and consider limiting access.
4. Strong Passwords and 2FA: Enforce strong, unique passwords for all user accounts and enable two-factor authentication (2FA) wherever possible.
5. Minimize Plugin Use: Audit your plugins regularly. Remove any unused or unnecessary plugins to reduce your attack surface.
6. Choose Reputable Developers: Select themes and plugins from trusted developers with good security track records and active support.
7. Regular Security Scans: Proactively scan your site for vulnerabilities, malware, and misconfigurations. This helps identify issues before attackers do.

Conclusion

Our scan of 43,960 domains, revealing 10,984 WordPress sites, paints a stark picture of the current security landscape. A majority of WordPress sites are operating without critical security headers, are poorly maintained, and rely heavily on popular plugins that, if unpatched, pose significant risks. The prevalence of phishing sites further demonstrates the tangible consequences of these vulnerabilities.

The good news is that many of these issues are addressable with proactive maintenance and the implementation of established security best practices. By understanding the risks highlighted in this report, site owners can take concrete steps to fortify their WordPress installations and protect their users.

Is your WordPress site secure? Find out now! Get a free security scan at https://heypulso.com.