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. This attribute does not adequately sanitize or escape user-supplied input, allowing an authenticated attacker with contributor-level permissions or higher to inject arbitrary JavaScript code. Because the malicious script is stored in the content and rendered on pages accessed by other users, it can execute in the context of any visitor's browser without requiring additional user interaction. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N) indicates that the attack can be launched remotely over the network with low complexity, requires privileges of a contributor or above, and does not need user interaction. The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially compromised component. The impact includes partial loss of confidentiality and integrity, such as theft of cookies, session tokens, or manipulation of page content, but does not affect availability. Although no known exploits have been reported in the wild, the vulnerability poses a significant risk to WordPress sites using this plugin, especially those with multiple contributors. The lack of a patch link suggests that a fix is pending or not yet publicly available, emphasizing the need for immediate attention from site administrators. The vulnerability is categorized under CWE-79, a common and well-understood class of web application security flaws.

For European organizations, this vulnerability can lead to unauthorized script execution within the context of their websites, potentially compromising user sessions, stealing sensitive information, or defacing web content. Organizations relying on the WP Company Info plugin, particularly those with contributor-level users who can add or edit content, face risks of internal threat actors or compromised accounts exploiting this flaw. The impact is heightened for organizations with customer-facing portals or intranets where sensitive data or authentication tokens might be exposed. Given the medium CVSS score, the vulnerability does not directly impact service availability but can undermine user trust and lead to reputational damage. Additionally, GDPR considerations around data protection and breach notification may apply if personal data is compromised. The scope change means that the vulnerability could affect multiple components or users beyond the initially compromised contributor account, increasing potential damage. Since WordPress powers a significant portion of European websites, especially among SMEs and public sector entities, the threat is non-trivial. The absence of known exploits in the wild currently reduces immediate risk but does not preclude future exploitation. Organizations with less mature patch management or monitoring processes are particularly vulnerable.

1. Monitor the WP Company Info plugin repository and vendor communications closely for an official patch and apply it immediately upon release. 2. Until a patch is available, restrict contributor-level access to trusted users only and review existing contributor accounts for suspicious activity. 3. Implement manual input validation and output escaping for the 'class' attribute in the 'social-networks' shortcode by customizing the plugin code or using WordPress hooks to sanitize inputs. 4. Employ Web Application Firewalls (WAFs) with rules targeting common XSS payloads to provide a temporary protective layer. 5. Conduct regular security audits and code reviews of plugins and themes to detect similar vulnerabilities early. 6. Educate content contributors about the risks of injecting untrusted content and enforce strict content policies. 7. Enable Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected sites. 8. Monitor logs and user activity for signs of exploitation attempts or anomalous behavior. 9. Backup website data regularly to enable quick restoration in case of compromise. 10. Consider disabling or replacing the WP Company Info plugin with a more secure alternative if immediate patching is not feasible.