CVE-2025-62240 is a cross-site scripting (XSS) vulnerability classified under CWE-79 that affects multiple versions of Liferay Portal (7.4.3.35 through 7.4.3.111) and Liferay DXP (2023.Q3.1 through 2023.Q4.5, including various updates). The vulnerability arises from improper neutralization of user-supplied input during web page generation, specifically in the Calendar events feature. Attackers can craft malicious payloads injected into user profile fields such as First Name, Middle Name, or Last Name. When these fields are rendered in the application, the injected scripts execute in the context of the victim's browser session. This can lead to theft of session cookies, unauthorized actions performed on behalf of the user, or redirection to malicious sites. The vulnerability does not require authentication to inject the payload but does require user interaction to trigger the script execution. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), user interaction required (UI:A), and low impact on confidentiality and integrity (VC:L, VI:L) with no impact on availability. There are no known exploits in the wild at the time of publication, and no official patches have been linked yet. The flaw is significant because Liferay Portal is widely used in enterprise environments for content management and collaboration, making it a valuable target for attackers seeking to compromise user sessions or escalate privileges via XSS.

For European organizations, this vulnerability poses a risk primarily to confidentiality and integrity of user sessions and data within Liferay Portal environments. Successful exploitation could allow attackers to execute arbitrary scripts in the context of authenticated users, potentially leading to session hijacking, credential theft, or unauthorized actions such as data manipulation or privilege escalation. This could disrupt business operations, lead to data breaches, and damage organizational reputation. Since Liferay Portal is commonly used by government agencies, educational institutions, and enterprises across Europe for intranet portals and collaboration platforms, the impact could be significant if exploited. The requirement for user interaction somewhat limits the attack scope but does not eliminate risk, especially in environments with high user traffic or where social engineering is feasible. The lack of known exploits in the wild provides a window for proactive mitigation. However, failure to address the vulnerability could expose organizations to targeted attacks, especially in sectors with sensitive or regulated data.

European organizations should immediately assess their Liferay Portal and DXP deployments to identify affected versions. Although no official patches are currently linked, organizations should monitor Liferay’s security advisories for updates and apply patches promptly once available. In the interim, implement strict input validation and output encoding on user-supplied data fields, particularly those related to user profiles and calendar events, to neutralize malicious scripts. Deploy web application firewalls (WAFs) with robust XSS detection and prevention rules tailored to Liferay’s traffic patterns. Educate users about the risks of interacting with suspicious links or inputs within the portal to reduce the likelihood of successful social engineering. Review and harden Content Security Policy (CSP) headers to restrict script execution sources. Conduct regular security audits and penetration tests focusing on XSS vectors within the portal. Additionally, consider disabling or restricting features that allow user input in vulnerable fields if feasible until patches are applied.