CVE-2025-59135 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, found in the eLEOPARD Behance Portfolio Manager software up to version 1.7.5. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing malicious scripts to be stored and executed in the context of other users' browsers. This type of vulnerability can be exploited by authenticated users who have the ability to submit content that is later rendered without proper sanitization or encoding. The CVSS 3.1 score of 5.9 indicates a medium severity, with the vector showing network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:H), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). Although no public exploits are known, the stored XSS can facilitate session hijacking, credential theft, defacement, or distribution of malware through trusted domains. The vulnerability is particularly concerning in environments where multiple users interact with portfolio content, such as creative agencies or freelance platforms. The lack of available patches increases the urgency for mitigation strategies. The vulnerability was reserved in September 2025 and published at the end of 2025, indicating recent discovery and disclosure.

For European organizations, especially those in the creative, marketing, and freelance sectors that rely on eLEOPARD Behance Portfolio Manager, this vulnerability poses risks including unauthorized access to user sessions, data leakage, and potential defacement of portfolio content. Attackers exploiting stored XSS can execute arbitrary scripts in the context of authenticated users, potentially leading to credential theft or lateral movement within the network. This can undermine trust in digital portfolios and damage reputations. The medium CVSS score suggests moderate risk, but the requirement for authenticated access and user interaction limits mass exploitation. However, targeted attacks against high-profile users or administrators could have significant consequences. Additionally, the vulnerability could be leveraged as a foothold for more complex attacks within organizations. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits over time. European data protection regulations such as GDPR also impose obligations to protect user data, and exploitation of this vulnerability could lead to compliance issues and fines.

Organizations should implement multiple layers of defense to mitigate this vulnerability. First, apply strict input validation and sanitization on all user-submitted content to prevent malicious scripts from being stored. Employ context-aware output encoding when rendering content in web pages to neutralize any injected code. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Limit user privileges to the minimum necessary, reducing the number of users who can submit content that is rendered to others. Monitor and audit user-generated content for suspicious inputs. Since no official patches are currently available, consider isolating or restricting access to the affected Behance Portfolio Manager instances, especially from external networks. Educate users about the risks of interacting with untrusted content and encourage cautious behavior. Finally, maintain up-to-date backups and incident response plans to quickly recover from any successful exploitation.