CVE-2025-62248 is a reflected cross-site scripting (XSS) vulnerability identified in Liferay Portal versions 7.4.0 through 7.4.3.132 and multiple Liferay DXP releases spanning 2024 and 2025. This vulnerability results from a regression that causes improper neutralization of user-supplied input during web page generation, specifically via the _com_liferay_dynamic_data_mapping_web_portlet_DDMPortlet_definition parameter. An authenticated attacker can craft a malicious URL containing JavaScript payloads in this parameter, which, when accessed by a victim, executes within their browser context. This can lead to session hijacking, credential theft, or unauthorized actions performed with the victim’s privileges. The vulnerability requires the attacker to have valid credentials (authenticated) and relies on user interaction (clicking the malicious link). The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required beyond authentication, and user interaction needed, with limited confidentiality impact and no integrity or availability impact. No public exploits have been reported yet, but the presence of this vulnerability in widely used enterprise portal software poses a significant risk. The issue stems from a regression, indicating a prior fix was undone or incomplete. Liferay Portal is commonly used in enterprise environments for content management and collaboration, making this vulnerability relevant for organizations relying on these platforms.

For European organizations, this vulnerability poses a moderate risk primarily to confidentiality and user trust. Exploitation could allow attackers to steal session cookies, impersonate users, or perform unauthorized actions within the portal, potentially exposing sensitive corporate data or internal communications. Since Liferay Portal is widely used in sectors such as government, education, and large enterprises across Europe, successful exploitation could disrupt business operations or lead to data breaches. The requirement for authentication limits the attack surface to insiders or compromised accounts, but phishing or social engineering could facilitate exploitation. The reflected nature of the XSS means attacks rely on tricking users into clicking malicious links, which can be distributed via email or other communication channels. Given the portal’s role in collaboration and content management, exploitation could undermine organizational security policies and compliance with data protection regulations like GDPR. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits over time.

European organizations should immediately assess their Liferay Portal and DXP versions to identify affected instances. Although no official patches are listed yet, organizations should monitor Liferay’s advisories and apply updates as soon as they become available. In the interim, implement strict input validation and output encoding on all user-supplied parameters, particularly the _com_liferay_dynamic_data_mapping_web_portlet_DDMPortlet_definition parameter, to prevent script injection. Employ web application firewalls (WAFs) with rules targeting reflected XSS patterns to detect and block malicious requests. Educate users about the risks of clicking on suspicious links, especially those requiring authentication. Review and tighten authentication controls to reduce the risk of compromised accounts being used for exploitation. Consider implementing Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Conduct regular security testing, including automated scanning and manual penetration testing focused on XSS vulnerabilities. Finally, maintain robust logging and monitoring to detect potential exploitation attempts promptly.