CVE-2025-11826 is a stored Cross-Site Scripting vulnerability identified in the WP Company Info plugin for WordPress, versions up to and including 1.9.0. The vulnerability stems from improper neutralization of input during web page generation, specifically within the 'class' attribute of the 'social-networks' shortcode. Authenticated users with contributor-level access or higher can exploit this flaw by injecting arbitrary JavaScript code that is stored persistently and executed in the context of any user visiting the affected page. This occurs because the plugin fails to adequately sanitize and escape user-supplied input before rendering it in the page HTML, violating CWE-79. The attack vector is remote over the network, with low complexity and no need for user interaction, but requires some level of authentication (contributor or above). The vulnerability impacts confidentiality and integrity by enabling script injection that can hijack user sessions, steal cookies, or perform unauthorized actions on behalf of users. Availability is not directly impacted. The CVSS 3.1 score of 6.4 reflects these factors. No public exploits are currently known, but the vulnerability is publicly disclosed and could be weaponized. The plugin is widely used in WordPress environments, often by small and medium enterprises to display company information and social media links. Given WordPress’s popularity in Europe, this vulnerability poses a tangible risk to many organizations. The lack of a patch at the time of disclosure necessitates interim mitigations such as privilege restriction and input validation. Monitoring and web application firewall (WAF) deployment can help detect and block exploitation attempts.

For European organizations, this vulnerability can lead to significant risks including session hijacking, unauthorized actions performed under compromised user sessions, and potential data leakage. Since the exploit requires contributor-level access, attackers who gain such privileges—either through credential compromise or social engineering—can implant persistent malicious scripts affecting all visitors to the site. This can damage organizational reputation, lead to data breaches, and facilitate further attacks such as phishing or malware distribution. The impact is particularly critical for organizations relying on WordPress for public-facing websites or intranet portals where multiple users have editing rights. SMEs, non-profits, and public sector entities in Europe that use the WP Company Info plugin are at risk of targeted attacks. Additionally, the cross-site scripting vulnerability can be leveraged to bypass same-origin policies, potentially exposing sensitive internal resources if the site is used within corporate networks. The medium severity rating suggests a moderate but actionable threat that requires timely remediation to prevent exploitation.

1. Monitor the WP Company Info plugin vendor’s channels for an official patch and apply it immediately upon release. 2. Until a patch is available, restrict contributor-level and higher privileges to trusted users only, minimizing the risk of malicious input injection. 3. Implement manual input validation and output escaping for the 'class' attribute in the 'social-networks' shortcode if possible by customizing the plugin or using WordPress hooks/filters. 4. Deploy a web application firewall (WAF) with rules to detect and block common XSS payloads targeting WordPress shortcodes and attributes. 5. Conduct regular audits of user roles and permissions to ensure no unauthorized privilege escalation has occurred. 6. Educate content contributors about the risks of injecting untrusted content and enforce strict content submission policies. 7. Monitor web server logs and application logs for unusual script injection patterns or suspicious user activity. 8. Consider temporarily disabling the 'social-networks' shortcode or the entire plugin if the risk is deemed unacceptable until a fix is available.