WordPress Brizy Plugin Flaw Exposes Thousands to Admin Takeover

WordPress powers over 43% of all websites globally, making it a persistent target for cybercriminals. In 2020, a critical vulnerability in the Brizy page builder plugin—CVE-2020-36714—exposed thousands of websites to unauthorized administrative access. This authorization bypass flaw demonstrates how seemingly minor development oversights can create significant exposure for organizations relying on third-party plugins, with direct implications for cyber insurance underwriting and claims assessment.

What Happened with CVE-2020-36714

The Brizy plugin, installed on approximately 100,000 WordPress sites at the time of discovery, contained a flawed authorization mechanism in its is_administrator() function. This function was responsible for determining whether a user had administrative privileges to access sensitive AJAX endpoints. Due to an incorrect capability check, authenticated users with minimal privileges could bypass authorization controls and gain access to administrative functions.

The vulnerability affected all plugin versions up to and including 1.0.125. Attackers who gained access to a valid user account—potentially through credential stuffing, social engineering, or purchasing compromised credentials on dark web markets—could exploit this flaw to escalate their privileges within the WordPress environment.

Why This Matters for Cyber Insurance

From an insurance perspective, CVE-2020-36714 represents a classic example of third-party risk materializing into a first-party loss. The vulnerability illustrates how organizations can inherit cyber risk through commonly used software components, even when their core infrastructure follows security best practices.

This incident contributed to claims frequency in the content management system attack category, which accounted for 12% of all cyber insurance claims in 2021 according to industry data. The vulnerability also highlights the importance of continuous vulnerability monitoring, as organizations using the Brizy plugin remained exposed for months after public disclosure until patches were applied.

For underwriters, this represents a coverage gap scenario where standard cyber insurance policies may not adequately address losses stemming from third-party plugin vulnerabilities. The incident demonstrates the need for comprehensive risk assessment frameworks that evaluate not just perimeter security but also the software supply chain.

Technical Details in Business Context

The core issue involved the plugin’s failure to properly validate user capabilities before granting access to sensitive administrative functions. In practical terms, this meant that a user account with basic subscriber-level access could potentially perform actions typically restricted to site administrators.

The vulnerability exploited the WordPress AJAX (Asynchronous JavaScript and XML) system, which allows web pages to update content without requiring a full page reload. Many administrative functions in WordPress plugins rely on AJAX calls, making them attractive targets for attackers seeking to perform actions without direct interface access.

From a business impact perspective, exploitation could lead to website defacement, data exfiltration, installation of backdoors, or injection of malicious code that compromises visitor systems. For organizations using WordPress for customer-facing websites or e-commerce platforms, such incidents can result in regulatory fines, brand damage, and business interruption losses.

The CVSS score of 7.4 indicates high severity, primarily due to the low complexity of exploitation and the potential for significant impact. The requirement for authentication does provide some mitigation, but the widespread availability of compromised credentials makes this a realistic attack scenario.

Implications for Coverage and Underwriting

CVE-2020-36714 creates several challenges for cyber insurance underwriting. First, it demonstrates the difficulty of assessing third-party risk exposure during the underwriting process. Traditional security questionnaires may not capture the full extent of plugin usage or update practices across an organization’s web presence.

For claims assessment, this vulnerability falls into the gray area between first-party and third-party coverage. While the initial compromise occurs through a third-party plugin, the resulting losses are typically first-party in nature, including business interruption, data breach response costs, and reputation damage.

Underwriters should consider this type of vulnerability when evaluating organizations with significant web presence, particularly those in retail, professional services, or any sector where website availability and integrity are critical to business operations. The incident frequency for WordPress plugin vulnerabilities has increased by 34% year-over-year, making this a relevant underwriting signal.

Risk Assessment Considerations

Organizations using WordPress should implement comprehensive plugin management processes that include regular vulnerability scanning, automated update mechanisms where possible, and periodic security reviews of installed plugins. The average organization uses 23 WordPress plugins, each representing a potential attack surface.

Risk engineers should evaluate not just the presence of vulnerable plugins but also the organization’s patch management capabilities and incident response procedures for web-based assets. The time between vulnerability disclosure and patch application often determines whether an organization will experience a successful attack.

Security teams should maintain an inventory of all web applications and their components, including themes and plugins, with version tracking and automated alerting for known vulnerabilities. This visibility is crucial for both preventing incidents and demonstrating due diligence in the event of a claim.

Organizations should also consider implementing web application firewalls (WAFs) with specific rules for WordPress attacks, as these can provide an additional layer of protection against exploitation of known vulnerabilities while patches are being applied.

Actionable Recommendations for Risk Professionals

Insurance professionals should incorporate WordPress plugin risk into their underwriting frameworks by requiring detailed inventories of web applications and their components. Organizations should demonstrate active patch management processes and provide evidence of regular vulnerability scanning for web assets.

For existing policyholders, risk engineers should conduct periodic reviews of web application security practices, particularly for organizations with customer-facing websites or e-commerce functionality. This includes evaluating backup and recovery procedures for web content and databases.

Organizations should implement continuous monitoring for known vulnerabilities in their web application components. This can be achieved through automated scanning tools that integrate with vulnerability databases and provide real-time alerts when vulnerable components are detected.

Security teams should establish clear procedures for plugin selection and approval, including security reviews before implementation and regular reassessment of necessity. Unused plugins should be removed promptly to reduce attack surface.

Consider requiring organizations to maintain web application security as part of their overall cybersecurity program, with specific controls for third-party component management. This includes staff training on secure plugin usage and incident response procedures for web-based attacks.

Finally, organizations should regularly test their incident response plans for web application compromises, including procedures for working with law enforcement, regulators, and customers in the event of a successful attack through a vulnerable plugin.

Key Takeaway

CVE-2020-36714 exemplifies how third-party software vulnerabilities can create material cyber risk for organizations and insurance carriers. The incident demonstrates the importance of comprehensive risk assessment that includes software supply chain evaluation, and highlights the need for proactive vulnerability management as a key underwriting criterion. Organizations using WordPress or similar content management systems must implement robust plugin management processes to reduce their exposure to this class of vulnerability, while insurers should factor third-party component risk into their coverage and pricing decisions.

For detailed guidance on quantifying these risks within your underwriting process, consult our FAIR-based risk assessment framework which provides structured methodologies for evaluating software supply chain exposures.