CVE-2025-10476 is a vulnerability identified in the WP Fastest Cache plugin for WordPress, specifically in versions up to and including 1.4.0. The issue stems from a missing authorization check (CWE-862) in the function wpfc_db_fix_callback(), which is responsible for performing database fix operations. Because the function lacks proper capability verification, any authenticated user with at least Subscriber-level privileges can invoke this function to initiate database fix actions that should normally be restricted. This vulnerability only affects installations where the premium version of the plugin is activated, as the vulnerable functionality is tied to premium features. The vulnerability does not require user interaction and can be exploited remotely over the network. The CVSS v3.1 score of 4.3 reflects a medium severity, with the vector indicating network attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality impact, limited integrity impact, and no availability impact. Although no known exploits have been reported in the wild, the vulnerability could allow attackers to modify database entries unauthorizedly, potentially leading to data integrity issues or disruption of caching behavior. The vulnerability was reserved in September 2025 and published in November 2025, with Wordfence as the assigner. No patches or fixes are currently linked, indicating that mitigation or updates may be pending or require manual intervention.

The primary impact of this vulnerability is unauthorized modification of data related to the caching plugin's database operations, which can undermine data integrity. Attackers with low-level authenticated access (Subscriber or above) can exploit this flaw to perform database fix actions that could alter or corrupt cached data or plugin-related database entries. This may lead to inconsistent website behavior, degraded performance, or potential disruption of caching mechanisms, indirectly affecting user experience. While confidentiality and availability are not directly impacted, the integrity compromise could facilitate further attacks or misconfigurations. Organizations relying on WP Fastest Cache premium features are at risk, especially if they allow low-privileged users to register or authenticate. The vulnerability could be leveraged in multi-user environments such as membership sites, forums, or content platforms. Given the widespread use of WordPress globally, the impact could be significant for websites that have not updated or mitigated this issue. The absence of known exploits reduces immediate risk but does not eliminate the potential for future exploitation.

To mitigate CVE-2025-10476, organizations should first verify if they are using the WP Fastest Cache plugin with the premium version activated. Immediate steps include restricting Subscriber-level user registrations or access where possible to reduce the attack surface. Administrators should monitor and audit user activities related to database fix operations within the plugin. Since no official patch is currently linked, consider disabling the premium features or the plugin temporarily if feasible until a vendor patch is released. Implementing Web Application Firewall (WAF) rules to detect and block unauthorized calls to wpfc_db_fix_callback() can provide additional protection. Review and tighten WordPress user role permissions to ensure minimal privileges are granted. Regularly update the plugin once a patch becomes available and subscribe to vendor advisories. Additionally, conduct integrity checks on the database and caching layers to detect any unauthorized changes. Employing security plugins that monitor for suspicious plugin behavior can also help detect exploitation attempts early.