CVE-2025-0862 identifies a stored cross-site scripting (XSS) vulnerability in the SuperSaaS online appointment scheduling plugin for WordPress, present in all versions up to and including 2.1.12. The vulnerability arises from improper neutralization of input during web page generation, specifically via the 'after' parameter, which lacks sufficient input sanitization and output escaping. This flaw allows authenticated attackers with Contributor-level privileges or higher to inject arbitrary JavaScript code into pages. When other users access these pages using Chromium-based browsers such as Chrome, Edge, or Brave, the injected scripts execute in their browser context. The vulnerability does not require user interaction beyond page access but does require the attacker to have authenticated access with at least Contributor rights, limiting exploitation scope. The CVSS 3.1 base score is 4.9 (medium severity), reflecting network attack vector, high attack complexity, low privileges required, no user interaction, and partial confidentiality and integrity impact without affecting availability. No public exploits have been reported to date. The vulnerability is classified under CWE-79, indicating improper input neutralization leading to XSS. This issue can enable session hijacking, defacement, or unauthorized actions within the context of the affected site. The plugin is widely used in WordPress environments for appointment scheduling, making it a relevant concern for organizations relying on this software. Mitigation involves patching the plugin once updates are available or applying strict input validation and output encoding on the 'after' parameter. Restricting Contributor-level access and monitoring for suspicious script injections are also recommended.

The primary impact of CVE-2025-0862 is on the confidentiality and integrity of affected web applications using the SuperSaaS plugin. Exploitation allows attackers to execute arbitrary JavaScript in the context of users visiting the compromised pages, potentially leading to session hijacking, theft of sensitive information, unauthorized actions performed on behalf of users, or defacement of web content. Although availability is not directly affected, the trustworthiness and security posture of the affected service can be significantly undermined. Since exploitation requires authenticated access with Contributor-level privileges, the risk is somewhat mitigated by access controls; however, in environments where Contributor access is broadly granted or compromised, the threat escalates. The limitation to Chromium-based browsers narrows the attack surface but still affects a large user base given the popularity of these browsers. Organizations relying on SuperSaaS for appointment scheduling, especially those with many contributors or editors, face increased risk of targeted attacks or insider threats leveraging this vulnerability. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future exploitation. Failure to address this vulnerability could lead to data breaches, reputational damage, and regulatory compliance issues for affected organizations.

1. Apply official patches or updates from the SuperSaaS plugin vendor as soon as they become available to address the input sanitization flaw. 2. Until patches are released, implement strict input validation and output encoding on the 'after' parameter to neutralize malicious scripts. 3. Restrict Contributor-level and higher access permissions to trusted users only, minimizing the number of accounts capable of injecting malicious content. 4. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 5. Monitor logs and web traffic for unusual script injection attempts or unexpected changes in appointment scheduling pages. 6. Educate site administrators and contributors about the risks of XSS and safe content management practices. 7. Consider using web application firewalls (WAFs) with rules targeting XSS payloads specific to this vulnerability. 8. Regularly audit user roles and permissions to ensure least privilege principles are enforced. 9. Encourage users to use browsers with updated security features and keep them patched. 10. Conduct security testing and code reviews on customizations or integrations involving the SuperSaaS plugin to detect similar vulnerabilities.