CVE-2023-1926 in WP Fastest Cache Plugin
Summary
by MITRE • 04/06/2023
The WP Fastest Cache plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.1.2. This is due to missing or incorrect nonce validation on the deleteCacheToolbar function. This makes it possible for unauthenticated attackers to perform cache deletion via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 04/09/2026
The WP Fastest Cache plugin represents a widely used caching solution for WordPress websites, designed to improve site performance by storing static versions of web pages. This particular vulnerability affects versions up to and including 1.1.2, where the plugin fails to implement proper security measures for critical administrative functions. The vulnerability manifests in the deleteCacheToolbar function which lacks adequate nonce validation, creating a significant security gap that can be exploited by malicious actors. The absence of proper authentication checks means that any user can potentially trigger cache deletion operations without proper authorization.
Cross-site request forgery vulnerabilities occur when an attacker can manipulate a victim into executing unintended actions on a web application where they are authenticated. In this case, the vulnerability allows unauthenticated attackers to perform cache deletion operations against WordPress sites running the affected plugin version. The attack requires social engineering tactics where an administrator is tricked into clicking on a malicious link or visiting a compromised website that contains the forged request. This type of vulnerability falls under CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in software applications. The vulnerability enables attackers to disrupt website performance and potentially gain further access to the site through cache manipulation.
The operational impact of this vulnerability extends beyond simple cache deletion, as it can significantly affect website availability and performance. When cache files are deleted, the website must regenerate these files on subsequent requests, leading to increased server load and slower response times. Attackers could exploit this vulnerability repeatedly to cause ongoing performance degradation, making the website less responsive to legitimate users. The vulnerability also undermines the security posture of WordPress installations, as it provides an attack vector that doesn't require authentication or complex exploitation techniques. This makes it particularly dangerous in environments where administrators may inadvertently click on malicious links or visit compromised websites.
Security professionals should immediately update the WP Fastest Cache plugin to versions that address this vulnerability, as no patch was available for the affected versions. The mitigation strategy should include implementing proper nonce validation mechanisms that ensure all administrative functions require valid authentication tokens before execution. Organizations should also conduct security audits of their WordPress installations to identify other potentially vulnerable plugins and themes that may lack proper CSRF protection. The vulnerability demonstrates the critical importance of implementing proper input validation and authentication checks in web applications, particularly for functions that modify system state or configuration. This issue aligns with ATT&CK technique T1211 which covers privilege escalation through manipulation of application execution flow, emphasizing the need for robust security controls in web application frameworks. Regular security monitoring and automated vulnerability scanning should be implemented to detect similar issues in other plugins and themes that may be running on the WordPress platform.