CVE-2025-11186 is a stored cross-site scripting vulnerability identified in the Cookie Notice & Compliance for GDPR / CCPA plugin for WordPress, developed by humanityco. This vulnerability affects all plugin versions up to and including 2.5.8. The root cause is insufficient input sanitization and output escaping in the cookies_accepted shortcode, which processes user-supplied attributes insecurely. Authenticated attackers with contributor-level privileges or higher can exploit this flaw by injecting arbitrary JavaScript code into pages generated by the plugin. Because the malicious script is stored persistently, it executes every time any user accesses the affected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting a medium severity level. The attack vector is network-based, requiring only low complexity and no user interaction, but does require authentication with contributor-level permissions. The scope is classified as changed, indicating that the vulnerability affects resources beyond the attacker’s privileges. No public exploits have been reported yet, but the vulnerability poses a significant risk to WordPress sites using this plugin, especially those with multiple contributors or editors. The vulnerability is categorized under CWE-79, which corresponds to improper neutralization of input during web page generation, a common cause of XSS issues. The plugin is widely used for GDPR and CCPA compliance, making this vulnerability relevant to many organizations handling user privacy notices.

The impact of CVE-2025-11186 is significant for organizations using the affected WordPress plugin, especially those with multiple authenticated users having contributor-level access or higher. Exploitation allows attackers to inject persistent malicious scripts that execute in the context of any user visiting the compromised pages. This can lead to session hijacking, theft of authentication cookies, unauthorized actions performed on behalf of users, defacement, or distribution of malware. Since the vulnerability affects a plugin designed for cookie compliance, it is likely present on sites handling sensitive user privacy information, increasing the risk of data leakage or regulatory non-compliance. The medium CVSS score reflects that while the attack requires authenticated access, the ease of exploitation and potential for widespread impact on site visitors make this a notable threat. Organizations with public-facing WordPress sites, especially those in regulated industries or with high traffic, could face reputational damage, data breaches, or loss of user trust if exploited. Additionally, the vulnerability could be leveraged as a pivot point for further attacks within the network if attackers gain foothold through contributor accounts.

To mitigate CVE-2025-11186, organizations should immediately update the Cookie Notice & Compliance for GDPR / CCPA plugin to a patched version once available from humanityco. Until a patch is released, administrators should restrict contributor-level access to trusted users only and audit existing contributor accounts for suspicious activity. Implementing a Web Application Firewall (WAF) with rules to detect and block common XSS payloads targeting the cookies_accepted shortcode can reduce exploitation risk. Additionally, site owners should enforce strict Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. Regularly scanning the website for injected scripts or anomalous content in pages generated by the plugin is recommended. Employing security plugins that monitor for changes in page content or unusual script insertions can provide early detection. Finally, educating contributors about safe input practices and limiting the use of shortcodes that accept user input can reduce attack surface. Backup procedures should be reviewed to ensure quick recovery if compromise occurs.