CVE-2025-27444 is a reflected Cross-Site Scripting (XSS) vulnerability identified in the RSform!Pro component versions 3.0.0 through 3.3.13 for the Joomla content management system. The vulnerability stems from improper neutralization of user input in the filter[dateFrom] GET parameter, which is reflected without proper escaping in the administrative backend interface. This flaw allows an attacker with authenticated access at the admin or editor privilege level to craft a malicious URL containing JavaScript code. When such a URL is accessed within the administrative interface, the injected script executes in the context of the victim's browser session. The vulnerability is classified under CWE-79, indicating improper input sanitization during web page generation. The CVSS 3.1 base score is 4.8 (medium severity), with vector AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N, indicating network attack vector, low attack complexity, high privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. No known exploits have been reported in the wild yet, and no patches have been linked at the time of publication. The vulnerability affects only authenticated users with elevated privileges, limiting the initial attack surface but still posing a risk of session hijacking, privilege escalation, or administrative interface manipulation if exploited.

For European organizations using Joomla with the RSform!Pro component in the affected versions, this vulnerability poses a moderate risk primarily to the confidentiality and integrity of administrative sessions. An attacker who has obtained admin or editor credentials—potentially through phishing, credential reuse, or insider threats—could exploit this vulnerability to execute arbitrary JavaScript in the context of the administrative backend. This could lead to theft of session tokens, unauthorized changes to form configurations, or injection of malicious content affecting website visitors or internal users. While availability is not directly impacted, the compromise of administrative controls could indirectly disrupt business operations or damage organizational reputation. Given the widespread use of Joomla in European public sector, education, and small to medium enterprises, the vulnerability could be leveraged in targeted attacks against organizations with weaker credential management or insufficient internal access controls. The reflected nature of the XSS requires user interaction, which somewhat limits automated exploitation but does not eliminate risk in environments where attackers have insider access or can lure administrators to malicious URLs.

1. Immediate mitigation should include updating the RSform!Pro component to a patched version once available from the vendor. In the absence of an official patch, organizations should implement strict input validation and output encoding for the filter[dateFrom] parameter in the administrative backend, ensuring all user-supplied data is properly escaped before rendering. 2. Enforce multi-factor authentication (MFA) for all administrative and editor accounts to reduce the risk of credential compromise. 3. Conduct regular audits of administrator and editor accounts to remove unnecessary privileges and monitor for suspicious login activity. 4. Educate administrative users about the risks of clicking on untrusted URLs, especially those containing query parameters. 5. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the administrative interface. 6. Monitor web server and application logs for unusual requests containing suspicious query parameters targeting the filter[dateFrom] input. 7. Consider implementing Web Application Firewall (WAF) rules to detect and block reflected XSS attack patterns targeting this parameter. 8. Isolate administrative interfaces from general internet access where possible, restricting access via VPN or IP whitelisting to reduce exposure.