CVE-2023-1927 in WP Fastest Cache Plugin
Summary
by MITRE • 04/07/2023
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 deleteCssAndJsCacheToolbar 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.
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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, creating a significant security risk for wordpress installations that rely on this plugin for performance optimization. The vulnerability stems from inadequate csrf protection mechanisms within the plugin's administrative functionality, specifically targeting the deleteCssAndJsCacheToolbar function that handles cache deletion operations. The flaw allows attackers to manipulate the plugin's cache management features without proper authentication, potentially compromising website performance and security.
The technical implementation of this csrf vulnerability occurs through the absence or improper validation of nonce tokens within the deleteCssAndJsCacheToolbar function. Nonce validation serves as a critical security control that ensures requests originate from legitimate administrative users by verifying the authenticity of each operation. When this validation is missing or incorrectly implemented, attackers can construct malicious requests that appear to come from authenticated administrators. The vulnerability specifically targets the plugin's toolbar functionality, which provides administrators with direct access to cache management operations, making it an attractive target for exploitation. This flaw operates at the application layer and requires no prior authentication, making it particularly dangerous as it can be exploited by unauthenticated attackers.
The operational impact of this vulnerability extends beyond simple cache deletion, potentially affecting website availability and performance. When an attacker successfully exploits this csrf vulnerability, they can trigger cache deletion operations that may result in increased server load, slower page load times, and degraded user experience. The vulnerability also creates opportunities for more sophisticated attacks, as cache manipulation can be combined with other techniques to further compromise the affected wordpress installation. Additionally, the automated nature of cache deletion attacks means that they can be executed repeatedly, potentially causing ongoing disruption to website operations. The attack vector relies on social engineering tactics where administrators are tricked into clicking malicious links, making it particularly challenging to defend against through traditional network security measures.
Mitigation strategies for this vulnerability should focus on immediate plugin updates to versions that address the csrf validation issues, as well as implementing additional security controls. The primary recommendation involves upgrading to the latest version of the WP Fastest Cache plugin where proper nonce validation has been implemented to prevent unauthorized cache deletion operations. Organizations should also consider implementing additional administrative controls such as two-factor authentication, limiting administrative access to trusted networks, and monitoring for unusual cache management activities. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery conditions in software applications, and maps to ATT&CK technique T1078 for valid accounts and T1566 for social engineering tactics. Network security teams should also implement monitoring solutions to detect anomalous cache deletion patterns that may indicate exploitation attempts, while administrators should exercise caution when clicking links from untrusted sources and maintain regular security audits of installed plugins.