CVE-2025-8290 is a stored Cross-Site Scripting (XSS) vulnerability identified in the List Subpages plugin for WordPress, developed by weblineindia. This vulnerability affects all versions up to and including 1.0.6. The root cause is insufficient input sanitization and output escaping of the 'title' parameter within the plugin's page generation process. Authenticated users with Contributor-level access or higher can exploit this flaw by injecting arbitrary JavaScript code into the title field of subpages. Because the injected script is stored persistently, it executes every time any user accesses the affected page, including administrators and other privileged users. The vulnerability allows attackers to perform actions such as session hijacking, defacement, or unauthorized operations by leveraging the victim's browser context. The CVSS v3.1 base score is 6.4, reflecting a medium severity level, with an attack vector of network, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with a scope change. No public exploits have been reported yet, but the vulnerability's presence in a widely used CMS plugin increases its potential risk. The plugin's market penetration in WordPress ecosystems worldwide makes this a relevant threat for many organizations relying on WordPress for content management.

The impact of CVE-2025-8290 is significant for organizations using the List Subpages plugin on WordPress sites. Exploitation allows authenticated contributors or higher to inject persistent malicious scripts, which execute in the context of any user visiting the compromised page. This can lead to theft of session cookies, enabling attackers to impersonate users, including administrators, potentially resulting in full site compromise. It may also facilitate unauthorized actions such as content manipulation, privilege escalation, or distribution of malware to site visitors. The confidentiality and integrity of user data and site content are at risk, though availability is not directly impacted. Given WordPress's widespread use globally, many organizations, especially those with multi-user content management workflows, face exposure. The vulnerability could be leveraged in targeted attacks against high-value websites or used in broader campaigns to compromise multiple sites for phishing or malware distribution.

To mitigate CVE-2025-8290, organizations should immediately update the List Subpages plugin to a patched version once available. Until a patch is released, restrict Contributor-level and higher user permissions to trusted individuals only, minimizing the risk of malicious script injection. Implement Web Application Firewalls (WAFs) with rules to detect and block suspicious script payloads in input fields, particularly the 'title' parameter. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected pages. Conduct regular security audits and monitoring for unusual activity or content changes in subpages. Additionally, sanitize and escape all user inputs rigorously in custom code and plugins to prevent similar vulnerabilities. Educate content contributors about the risks of injecting untrusted content and establish strict content approval workflows. Finally, maintain regular backups to enable recovery in case of compromise.