CVE-2025-5564 is a stored Cross-Site Scripting (XSS) vulnerability identified in the GC Social Wall plugin for WordPress, developed by gurievcreative. The vulnerability exists in all versions up to and including 1.15 due to insufficient sanitization and escaping of user-supplied attributes within the plugin's 'gc_social_wall' shortcode. This flaw allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code into pages where the shortcode is used. When other users access these pages, the malicious scripts execute in their browsers, potentially leading to session hijacking, defacement, or unauthorized actions performed on behalf of the victim. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. The CVSS 3.1 base score is 6.4, reflecting medium severity, with an attack vector of network, low attack complexity, requiring privileges (PR:L), no user interaction, and scope change (S:C). No public exploits have been reported yet, but the vulnerability's presence in a widely used WordPress plugin makes it a significant risk. The vulnerability’s impact is limited to sites that allow contributor-level users to add or modify content using the vulnerable shortcode, which is common in multi-author blogs or community sites. The lack of output escaping means that malicious scripts can persist in the database and affect all visitors to the compromised pages. The vulnerability highlights the importance of rigorous input validation and output encoding in plugin development to prevent XSS attacks.

The impact of CVE-2025-5564 is primarily on the confidentiality and integrity of affected WordPress sites and their users. Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts, which execute in the browsers of any user visiting the infected page. This can lead to session hijacking, theft of sensitive information such as cookies or credentials, unauthorized actions performed with the victim's privileges, and potential site defacement. Although availability is not directly affected, the trustworthiness of the site is compromised, potentially damaging reputation and user confidence. Organizations relying on the GC Social Wall plugin, especially those with multiple contributors or community-driven content, face increased risk of insider threats or compromised contributor accounts being leveraged for attacks. The medium CVSS score reflects that exploitation requires authenticated access but no user interaction, making it moderately easy to exploit in environments where contributor roles are common. The scope change indicates that the vulnerability affects not only the contributor's privileges but also impacts other users visiting the site, broadening the attack surface. Failure to address this vulnerability could lead to targeted attacks against site visitors, data leakage, and potential regulatory compliance issues related to user data protection.

To mitigate CVE-2025-5564, organizations should take the following specific actions: 1) Immediately update the GC Social Wall plugin to a patched version once available from the vendor, as no patch links are currently provided but should be prioritized upon release. 2) Restrict contributor-level permissions by auditing user roles and limiting the number of users with contributor or higher access, especially on sites where the plugin is active. 3) Implement Web Application Firewall (WAF) rules to detect and block suspicious shortcode attribute inputs that may contain script tags or suspicious payloads. 4) Conduct regular security reviews and code audits of custom shortcodes and plugins to ensure proper input sanitization and output escaping are enforced. 5) Educate content contributors about the risks of injecting untrusted content and enforce strict content submission guidelines. 6) Monitor site logs and user activity for unusual shortcode usage or unexpected content changes. 7) Consider disabling or removing the GC Social Wall plugin if it is not essential to reduce the attack surface. 8) Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers visiting the site. These measures, combined with timely patching, will reduce the risk of exploitation and protect both site integrity and user data.