CVE-2022-3427 in Corner Ad Plugin
Summary
by MITRE • 12/15/2022
The Corner Ad plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.0.56. This is due to missing or incorrect nonce validation on its corner_ad_settings_page function. This makes it possible for unauthenticated attackers to trigger the deletion of ads via forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 04/09/2026
The Corner Ad plugin for WordPress represents a significant security vulnerability that has been identified through CVE-2022-3427, affecting versions up to and including 1.0.56. This vulnerability manifests as a cross-site request forgery flaw that undermines the integrity of the plugin's administrative functions. The issue stems from inadequate nonce validation within the corner_ad_settings_page function, which serves as a critical security mechanism designed to prevent unauthorized administrative actions. Without proper validation of these cryptographic tokens, the plugin fails to verify the authenticity of requests originating from legitimate administrators versus malicious actors attempting to exploit the system.
The technical flaw in this vulnerability operates at the core of WordPress's security architecture, specifically targeting the nonce validation system that is fundamental to preventing CSRF attacks. Nonces, or number used once, serve as time-sensitive tokens that ensure only authorized users can perform administrative actions within WordPress installations. When the corner_ad_settings_page function fails to properly validate these nonces, it creates an exploitable condition where attackers can craft malicious requests that appear legitimate to the WordPress system. This weakness allows unauthenticated attackers to manipulate the plugin's functionality by triggering unauthorized deletions of advertisements through forged requests, effectively bypassing the normal authentication and authorization mechanisms that should protect such critical operations.
The operational impact of this vulnerability extends beyond simple data manipulation, creating a potential pathway for more severe security breaches within WordPress environments. Administrators who inadvertently click on malicious links or visit compromised websites can unknowingly execute destructive actions against their advertisement campaigns, potentially leading to revenue loss, reputational damage, and compromised site integrity. The vulnerability's exploitation requires social engineering elements to trick administrators into performing actions, but once successful, it provides attackers with direct control over advertisement management functions. This makes the vulnerability particularly dangerous in environments where administrators frequently interact with external links or where phishing attacks are common.
Security professionals should recognize this vulnerability as a classic example of insufficient input validation and authentication checks, aligning with CWE-352 which specifically addresses Cross-Site Request Forgery vulnerabilities. The attack pattern follows established methodologies described in the MITRE ATT&CK framework under the T1211 technique for exploitation of web application vulnerabilities, where adversaries leverage weaknesses in web applications to execute unauthorized commands. Organizations should implement immediate mitigations including updating to patched versions of the Corner Ad plugin, implementing additional security layers such as web application firewalls, and conducting security awareness training for administrators to recognize potential social engineering attempts. The vulnerability also highlights the importance of regular security audits and proper validation of all user inputs within WordPress plugins, as the absence of nonce validation represents a fundamental flaw in the plugin's security architecture that could be exploited by threat actors with minimal technical expertise.