CVE-2025-62246 is a stored cross-site scripting (XSS) vulnerability classified under CWE-79, affecting Liferay Portal versions 7.4.0 through 7.4.3.111 and several Liferay DXP versions including 2023.Q4.0 through 2023.Q4.5, 2023.Q3.1 through 2023.Q3.8, and 7.4 GA through update 92. The vulnerability arises from improper neutralization of input during web page generation, specifically in user name fields (first, middle, last name) that are rendered in various widgets supporting comments and mentions. Remote authenticated users can inject arbitrary HTML or JavaScript payloads into these fields, which are then stored and executed in the context of other users viewing the affected widgets. This can lead to session hijacking, unauthorized actions, or data theft. Exploitation requires the attacker to have valid user credentials and to craft payloads that are accepted by the input validation mechanisms. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required beyond authentication, and user interaction is needed. The impact on confidentiality, integrity, and availability is low to moderate, as the vulnerability allows script execution but within the constraints of authenticated user sessions and limited scope. No public exploits have been reported yet, but the vulnerability is publicly disclosed and should be addressed promptly. The lack of available patches at the time of disclosure necessitates interim mitigations such as input sanitization and monitoring.

For European organizations, this vulnerability poses a risk primarily to web portals and collaborative platforms built on affected Liferay versions. Exploitation could lead to unauthorized script execution in users' browsers, enabling session hijacking, credential theft, or unauthorized actions within the portal. This can compromise sensitive organizational data, disrupt business operations, and damage reputation. Public sector entities, educational institutions, and enterprises using Liferay for internal or external collaboration are particularly at risk. Given the requirement for authentication and user interaction, the threat is somewhat mitigated but still significant in environments with many users and high interaction. The vulnerability could be leveraged in targeted phishing or social engineering campaigns to escalate impact. Additionally, the stored nature of the XSS means malicious scripts persist and affect multiple users over time until remediated. The impact on availability is limited but possible if injected scripts perform disruptive actions. Overall, the vulnerability could facilitate lateral movement or privilege escalation in complex attack chains.

1. Apply official patches from Liferay as soon as they become available to address the vulnerability directly. 2. Until patches are released, implement strict input validation and output encoding on user name fields and all comment or mention-enabled widgets to neutralize malicious scripts. 3. Restrict the characters allowed in user name fields to exclude HTML tags and JavaScript code. 4. Employ Content Security Policy (CSP) headers to limit script execution sources and reduce XSS impact. 5. Monitor logs and user activity for unusual input patterns or repeated injection attempts. 6. Educate users about phishing and social engineering risks that could facilitate exploitation. 7. Limit user privileges to the minimum necessary to reduce the potential impact of compromised accounts. 8. Consider deploying Web Application Firewalls (WAF) with rules targeting common XSS payloads specific to Liferay portals. 9. Regularly review and audit portal configurations and customizations that might affect input handling. 10. Prepare incident response plans to quickly address any detected exploitation attempts.