CVE-2025-62248 is a reflected cross-site scripting (XSS) vulnerability classified under CWE-79, affecting Liferay Portal 7.4.0 through 7.4.3.132 and multiple Liferay DXP versions released between 2024 and 2025. This vulnerability arises due to improper neutralization of user-supplied input during web page generation, specifically through the _com_liferay_dynamic_data_mapping_web_portlet_DDMPortlet_definition parameter. An authenticated attacker can craft a malicious URL containing JavaScript payloads within this parameter. When a victim user accesses this URL, the injected script executes in their browser context, potentially allowing the attacker to steal session cookies, perform actions on behalf of the user, or conduct further attacks such as phishing or malware delivery. The vulnerability is a regression, indicating it was previously fixed but reintroduced in recent versions. Exploitation requires the attacker to have valid credentials and the victim to interact with the malicious link, limiting the attack surface. The CVSS 4.0 score of 4.8 reflects a medium severity due to network attack vector, low complexity, no need for privileges beyond authentication, and user interaction required. No public exploits have been reported yet, but the presence of this vulnerability in widely used enterprise portal software poses a significant risk if left unaddressed.

For European organizations, the impact of CVE-2025-62248 can be significant, especially for those relying on Liferay Portal and DXP for critical internal and external web services. Successful exploitation could lead to session hijacking, unauthorized actions performed with the victim's privileges, and potential data leakage. This can undermine user trust, cause compliance issues under GDPR due to unauthorized data access, and disrupt business operations. Public sector entities and large enterprises using Liferay for intranet portals, customer-facing websites, or digital services are particularly vulnerable. The requirement for authentication and user interaction somewhat limits the scope but does not eliminate risk, as phishing campaigns or insider threats could facilitate exploitation. The reflected XSS could also serve as a stepping stone for more advanced attacks, including privilege escalation or lateral movement within networks.

Organizations should immediately upgrade to Liferay versions where this vulnerability is patched once available. In the interim, implement strict input validation and output encoding on the _com_liferay_dynamic_data_mapping_web_portlet_DDMPortlet_definition parameter to neutralize malicious scripts. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting this parameter. Educate users about the risks of clicking on unsolicited or suspicious links, especially within authenticated sessions. Review and tighten authentication and session management controls to limit the impact of session hijacking. Conduct regular security assessments and code reviews focusing on input handling in dynamic data mapping components. Monitor logs for unusual URL access patterns that may indicate attempted exploitation. Consider implementing Content Security Policy (CSP) headers to restrict script execution origins and reduce XSS impact.