CVE-2025-10055 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the mrdenny Time Sheets plugin for WordPress, affecting all versions up to and including 2.1.3. The root cause is the absence or incorrect implementation of nonce validation on several plugin endpoints. Nonces in WordPress serve as tokens to verify that requests originate from legitimate users and not from malicious third-party sites. Without proper nonce checks, attackers can craft malicious links or forms that, when visited or submitted by an authenticated administrator, cause unintended actions such as modifying timesheet entries or other plugin-related data. This vulnerability does not require the attacker to be authenticated, but successful exploitation depends on social engineering to induce an administrator to interact with the malicious request (user interaction required). The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N) indicates network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality or availability impact, but limited integrity impact. No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed promptly. The plugin’s widespread use in WordPress environments makes it a relevant concern, especially for organizations relying on this plugin for time tracking and workforce management.

For European organizations, exploitation of this CSRF vulnerability could result in unauthorized modifications to time sheet data or related administrative settings within the affected plugin. Although it does not compromise sensitive data confidentiality or system availability, integrity of business-critical records could be undermined, potentially affecting payroll, compliance, and operational accuracy. Organizations with administrators who frequently access WordPress dashboards are at risk, especially if phishing or social engineering tactics are successful. The impact is more pronounced in sectors with strict labor regulations or audit requirements, where data integrity is paramount. Additionally, compromised administrative actions could be leveraged as a foothold for further attacks if combined with other vulnerabilities. The medium severity rating reflects these limited but meaningful risks. European companies using the mrdenny Time Sheets plugin should consider the potential reputational and operational consequences of manipulated timesheet data.

Immediate mitigation should focus on minimizing administrator exposure to CSRF attacks by implementing additional security controls beyond the plugin’s current capabilities. Organizations should: 1) Monitor for plugin updates or patches from the vendor and apply them promptly once available. 2) Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious cross-site requests targeting the plugin’s endpoints. 3) Enforce multi-factor authentication (MFA) for WordPress administrator accounts to reduce the risk of compromised credentials being exploited. 4) Educate administrators about phishing and social engineering risks to prevent inadvertent interaction with malicious links. 5) Consider temporarily restricting administrative access to trusted networks or VPNs to reduce exposure. 6) Review and harden WordPress security settings, including limiting plugin usage to essential personnel. 7) If feasible, implement custom nonce validation or CSRF tokens at the application level as an interim protective measure. These steps go beyond generic advice by focusing on compensating controls and user awareness tailored to this vulnerability’s exploitation vector.