CVE-2025-23989 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Internal Link Builder plugin developed by Alessandro Piconi, affecting versions up to 1.0. CSRF vulnerabilities occur when a web application does not adequately verify that requests modifying state originate from legitimate users. In this case, the Internal Link Builder plugin fails to implement proper anti-CSRF tokens or other verification mechanisms, allowing attackers to craft malicious web pages that, when visited by authenticated users, can trigger unauthorized actions within the plugin. These actions could include modifying internal links or other plugin-managed settings, potentially disrupting website functionality or integrity. The vulnerability does not require the attacker to have direct access to the victim's credentials but relies on the victim being logged into the affected system and visiting a malicious site. No public exploits have been reported yet, and no patches are currently linked, indicating that the vendor may not have released a fix at the time of publication. The absence of a CVSS score necessitates an independent severity assessment, which considers the attack vector, required privileges, and potential impact on confidentiality, integrity, and availability. Given that exploitation requires user authentication and interaction but can lead to unauthorized state changes, the vulnerability is rated medium severity. Organizations using this plugin should be aware of the risk and implement compensating controls until an official patch is available.

The primary impact of this CSRF vulnerability is on the integrity and availability of the affected web application. An attacker can cause authenticated users to unknowingly perform actions that alter internal link configurations or other plugin-managed data, potentially leading to website misconfigurations, broken navigation, or degraded user experience. This can indirectly affect the confidentiality of the site if attackers manipulate links to redirect users to malicious sites or phishing pages. While the vulnerability does not allow direct data theft or remote code execution, the unauthorized changes can disrupt business operations, damage reputation, and require time-consuming remediation. Since exploitation requires the victim to be authenticated and visit a malicious site, the scope is limited to users with sufficient privileges, typically site administrators or editors. Organizations with high traffic websites using this plugin are at greater risk of targeted attacks aiming to degrade site integrity or perform social engineering via manipulated links.

To mitigate this vulnerability, organizations should first verify whether an official patch or update from Alessandro Piconi is available and apply it promptly. In the absence of a patch, implement the following specific measures: 1) Enforce strict anti-CSRF tokens on all state-changing requests within the plugin to ensure requests originate from legitimate sources. 2) Restrict plugin access to the minimum necessary user roles and privileges to reduce the attack surface. 3) Employ Content Security Policy (CSP) headers to limit the domains that can execute scripts or submit forms, reducing the risk of malicious cross-site requests. 4) Educate users, especially administrators, to avoid clicking on suspicious links or visiting untrusted websites while logged into the CMS. 5) Monitor web server and application logs for unusual POST requests or changes to internal link configurations that could indicate exploitation attempts. 6) Consider deploying Web Application Firewalls (WAFs) with rules to detect and block CSRF attack patterns targeting this plugin. 7) Regularly audit and review plugin usage and configurations to detect unauthorized changes early.