The CVE-2025-10055 vulnerability is a Cross-Site Request Forgery (CSRF) issue identified in the mrdenny Time Sheets plugin for WordPress, affecting all versions up to and including 2.1.3. CSRF vulnerabilities occur when a web application does not properly verify that requests made to it originate from authenticated and intended users. In this case, the plugin lacks or incorrectly implements nonce validation—a security token mechanism designed to ensure that requests are legitimate and initiated by authorized users. This deficiency allows an unauthenticated attacker to craft malicious requests that, when executed by a logged-in site administrator (typically via clicking a specially crafted link), can perform unauthorized actions on the site. These actions might include modifying time sheet entries, altering configurations, or other administrative tasks permitted by the plugin's endpoints. The vulnerability has a CVSS 3.1 base score of 4.3, reflecting its medium severity, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), no confidentiality impact (C:N), low integrity impact (I:L), and no availability impact (A:N). No public exploits have been reported yet, but the risk remains due to the ease of exploitation via social engineering. The vulnerability was published on December 5, 2025, and is assigned to the CWE-352 category, which covers CSRF issues. Since the plugin is used for time sheet management, unauthorized changes could disrupt workforce tracking and payroll processes. The lack of a patch link suggests that a fix may not yet be available, emphasizing the need for interim mitigations.

For European organizations, especially those utilizing WordPress with the mrdenny Time Sheets plugin, this vulnerability poses a risk to the integrity of time tracking and administrative data. Unauthorized modifications could lead to inaccurate employee work records, payroll errors, and potential compliance issues with labor regulations. While confidentiality and availability are not directly impacted, the integrity breach can undermine trust in internal systems and cause operational disruptions. The requirement for user interaction (administrator clicking a malicious link) means phishing or social engineering campaigns could be leveraged by attackers. Given the widespread use of WordPress in Europe, particularly among SMEs and public sector entities managing workforce data, the impact could be significant if exploited. Additionally, organizations in regulated industries with strict audit requirements may face increased scrutiny or penalties if such integrity violations occur. The absence of known exploits reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability is publicly known.

1. Immediately restrict administrative access to the WordPress backend to trusted networks and users, employing IP whitelisting or VPN access where feasible. 2. Educate site administrators and privileged users about the risks of phishing and social engineering, emphasizing caution when clicking links from untrusted sources. 3. Implement Web Application Firewall (WAF) rules to detect and block suspicious POST requests targeting the Time Sheets plugin endpoints. 4. Monitor administrative actions and audit logs for unusual or unauthorized changes to time sheet data. 5. If possible, temporarily disable the Time Sheets plugin until a security patch is released by the vendor. 6. For developers or site maintainers, add or enforce nonce validation on all plugin endpoints handling state-changing requests to ensure requests originate from legitimate users. 7. Keep WordPress core and all plugins updated regularly to reduce exposure to known vulnerabilities. 8. Consider deploying Content Security Policy (CSP) headers to limit the execution of unauthorized scripts that could facilitate CSRF attacks.