CVE-2023-1928 in WP Fastest Cache Plugin
Summary
by MITRE • 04/07/2023
The WP Fastest Cache plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check on the wpfc_preload_single_callback function in versions up to, and including, 1.1.2. This makes it possible for authenticated attackers with subscriber-level access to initiate cache creation.
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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 environments that significantly impacts website performance and user experience through content delivery optimization. This particular vulnerability exists within the plugin's architecture where proper access control mechanisms have been omitted from critical functions. The specific flaw resides in the wpfc_preload_single_callback function which serves as an interface for initiating cache preloading operations. When examining this vulnerability through the lens of cybersecurity frameworks, it aligns with CWE-284 Access Control Issues, specifically manifesting as insufficient access control checks that allow unauthorized privilege escalation within the wordpress ecosystem.
The technical implementation of this vulnerability stems from the absence of capability verification before executing cache creation operations. An attacker with subscriber-level privileges can exploit this weakness to trigger cache generation processes that should typically be restricted to administrators or users with elevated permissions. This misconfiguration allows for unauthorized modification of cache data structures and potentially impacts the overall caching infrastructure. The vulnerability operates within the wordpress user role system where subscriber accounts normally lack the authorization to perform administrative functions, yet the missing capability check permits these users to access functionality that could disrupt normal operations or provide information disclosure opportunities.
From an operational perspective, this vulnerability creates significant risks for wordpress installations that rely on the WP Fastest Cache plugin for performance optimization. Attackers could leverage this weakness to consume excessive server resources through repeated cache creation requests, potentially leading to performance degradation or denial of service conditions. The impact extends beyond simple resource exhaustion as the unauthorized modification of cache data could lead to inconsistent content delivery, corrupted cache states, or even provide attackers with insights into the website's internal structure and content organization. This vulnerability particularly affects sites where subscriber accounts might be compromised through social engineering or credential theft attacks, as the attacker could utilize these compromised accounts to escalate their privileges within the caching system.
Mitigation strategies for this vulnerability should focus on immediate plugin updates to versions that include proper capability checks and access controls. System administrators should ensure that all wordpress installations maintain current plugin versions and implement comprehensive monitoring for unauthorized cache modification activities. The implementation of role-based access controls within wordpress environments becomes critical, ensuring that user permissions align with their actual operational requirements. Additionally, network segmentation and firewall rules can help limit access to caching functions while regular security audits should verify that all plugin functions properly enforce authorization checks. Organizations should also consider implementing web application firewalls that can detect and block suspicious cache-related requests from low-privilege accounts, aligning with ATT&CK technique T1078 Valid Accounts to prevent abuse of compromised credentials for privilege escalation.