The Remove Post Type Slug plugin for WordPress, developed by akshayshah5189, suffers from a Cross-Site Request Forgery (CSRF) vulnerability identified as CVE-2025-14167. This vulnerability exists in all versions up to and including 1.0.2 due to flawed nonce validation logic. Specifically, the plugin uses a logical OR (||) operator instead of the correct logical AND (&&) when validating the nonce field. This incorrect logic causes the validation to pass when the nonce field is not empty OR when verification fails, rather than requiring both conditions to be true to fail validation. As a result, attackers can craft forged HTTP requests that modify the plugin’s post type slug removal settings without authentication. The attack vector is remote (network), requires no privileges, but does require user interaction, such as tricking an administrator into clicking a malicious link. The impact is limited to integrity, as attackers can alter plugin settings, potentially affecting site behavior or enabling further attacks. No confidentiality or availability impacts are noted. There are no known exploits in the wild, and no patches have been linked yet. The CVSS v3.1 score is 4.3, reflecting a medium severity level with low attack complexity and no privileges required.

For European organizations, this vulnerability poses a risk primarily to the integrity of WordPress sites using the Remove Post Type Slug plugin. Unauthorized modification of plugin settings could result in altered site URLs or content presentation, potentially disrupting business operations or user experience. While the vulnerability does not directly expose sensitive data or cause denial of service, the altered configurations could be leveraged as a foothold for further attacks, such as privilege escalation or injection of malicious content. Organizations relying on WordPress for public-facing websites, e-commerce, or internal portals may face reputational damage or operational disruption if attackers exploit this flaw. The requirement for user interaction (administrator clicking a link) means social engineering defenses and user awareness are critical. Given WordPress’s widespread use in Europe, especially among SMEs and public sector entities, the impact could be significant if left unmitigated.

To mitigate this vulnerability, organizations should first verify if the Remove Post Type Slug plugin is installed and identify the version in use. Immediate steps include: 1) Updating the plugin to a fixed version once available from the vendor or developer. 2) If no patch is available, temporarily disabling the plugin to eliminate the attack surface. 3) Implementing Web Application Firewall (WAF) rules to detect and block suspicious POST requests targeting the plugin’s settings endpoints. 4) Enhancing administrator awareness to avoid clicking on untrusted links, especially those that could trigger configuration changes. 5) Reviewing and tightening WordPress user permissions to limit administrator accounts and enforce multi-factor authentication to reduce the risk of compromised credentials. 6) Monitoring logs for unusual POST requests or changes to plugin settings. 7) Employing Content Security Policy (CSP) headers to reduce the risk of CSRF and other injection attacks. These steps go beyond generic advice by focusing on immediate plugin-specific actions and operational controls tailored to this vulnerability.