CVE-2025-23566 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Custom Post plugin (versions up to 1.0) developed by syedamirhussain91. The plugin is designed to facilitate custom post types in WordPress environments. The vulnerability allows attackers to craft malicious requests that, when executed by an authenticated user, cause unauthorized actions to be performed without the user's consent. This CSRF flaw is compounded by the presence of Stored Cross-Site Scripting (XSS), enabling attackers to inject persistent malicious scripts into the application. These scripts execute in the context of users' browsers, potentially stealing sensitive information, hijacking sessions, or performing other malicious activities. The vulnerability does not require user interaction beyond the victim visiting a malicious page, and no authentication bypass is necessary as the attack leverages the victim's authenticated session. Although no known exploits have been reported in the wild, the lack of available patches increases risk. The vulnerability affects all versions up to 1.0, with no specified minimum version, indicating a broad impact on users of this plugin. The absence of a CVSS score necessitates a severity assessment based on impact and exploitability factors.

The impact of CVE-2025-23566 is significant for organizations using the Custom Post plugin in their WordPress sites. Successful exploitation can lead to unauthorized actions performed with the privileges of authenticated users, including administrators, which can compromise site integrity and confidentiality. Stored XSS can enable attackers to execute arbitrary JavaScript code persistently, leading to session hijacking, data theft, defacement, or malware distribution. This can damage organizational reputation, lead to data breaches, and disrupt business operations. The vulnerability can also facilitate lateral movement within compromised environments if administrative privileges are obtained. Given the widespread use of WordPress globally, organizations ranging from small businesses to large enterprises that rely on this plugin are at risk. The absence of patches and known exploits in the wild currently limits immediate widespread impact but also means organizations must proactively mitigate the risk to avoid future exploitation.

Organizations should immediately audit their WordPress installations to identify the presence of the Custom Post plugin by syedamirhussain91. Until an official patch is released, administrators should consider disabling or uninstalling the plugin to eliminate exposure. Implementing Web Application Firewall (WAF) rules to detect and block CSRF attack patterns targeting this plugin can provide temporary protection. Enforcing strict Content Security Policy (CSP) headers can help mitigate the impact of Stored XSS by restricting script execution sources. Additionally, site administrators should ensure that all users have the minimum necessary privileges to reduce the potential impact of compromised accounts. Monitoring logs for unusual POST requests or suspicious activity related to the plugin's endpoints is advised. Once a patch becomes available, prompt application of updates is critical. Educating users about the risks of clicking on untrusted links can also reduce the likelihood of successful CSRF attacks.