The Slippy Slider – Responsive Touch Navigation Slider plugin for WordPress suffers from a stored cross-site scripting (XSS) vulnerability identified as CVE-2025-11874. This vulnerability is due to improper neutralization of script-related HTML tags (CWE-80) within the plugin's 'slippy-slider' shortcode. Specifically, the plugin fails to adequately sanitize and escape user-supplied attributes before rendering them on pages, enabling an attacker with contributor-level or higher privileges to inject arbitrary JavaScript code. Because the vulnerability is stored, the malicious script persists in the database and executes every time a user accesses the affected page. The attack vector requires authentication (contributor or above) and user interaction (visiting the infected page). The CVSS 3.1 base score is 5.4, reflecting network attack vector, low attack complexity, privileges required, and user interaction needed, with partial confidentiality and integrity impact but no availability impact. No patches or exploit code are currently publicly available, but the vulnerability is present in all versions up to and including 2.0 of the plugin. This vulnerability can be leveraged to steal session cookies, perform actions on behalf of users, or deface content, undermining site integrity and user trust.

The primary impact of CVE-2025-11874 is the compromise of confidentiality and integrity on affected WordPress sites using the Slippy Slider plugin. An attacker with contributor-level access can inject persistent malicious scripts that execute in the context of any user visiting the infected page, potentially leading to session hijacking, credential theft, unauthorized actions, or content manipulation. While availability is not directly affected, the reputational damage and potential data breaches can be significant. Organizations relying on this plugin risk unauthorized access escalation and data leakage, especially if users with higher privileges (editors, admins) interact with the compromised pages. The vulnerability could also be used as a foothold for further attacks within the site or network. Since exploitation requires authentication, the risk is somewhat mitigated but remains critical in environments with many contributors or weak access controls.

1. Immediately update the Slippy Slider plugin to a patched version once available from the vendor. 2. In the absence of a patch, restrict contributor-level and higher privileges to trusted users only, minimizing the risk of malicious shortcode injection. 3. Implement strict input validation and output escaping on all user-supplied data, especially shortcode attributes, either via custom code or security plugins that sanitize shortcode inputs. 4. Employ a Web Application Firewall (WAF) with rules to detect and block XSS payloads targeting the plugin's shortcode parameters. 5. Regularly audit user roles and permissions to ensure least privilege principles are enforced. 6. Monitor site content for unexpected script injections or modifications. 7. Educate content contributors about safe content practices and the risks of injecting untrusted code. 8. Consider disabling or replacing the vulnerable plugin if immediate patching is not feasible. 9. Use Content Security Policy (CSP) headers to limit the impact of injected scripts by restricting script sources and execution contexts.