CVE-2025-62917 identifies a stored Cross-site Scripting (XSS) vulnerability in the Jamel.Z Tooltipy plugin, specifically versions up to and including 5.5.9. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows malicious scripts to be stored persistently within the application. When other users access the affected pages, the injected scripts execute in their browsers, potentially enabling attackers to hijack user sessions, steal sensitive data, or perform unauthorized actions within the context of the victim's session. The CVSS 3.1 base score of 5.4 indicates a medium severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. Confidentiality and integrity impacts are low, and availability is not affected. No known exploits have been reported in the wild, and no official patches have been released at the time of publication. The vulnerability is particularly relevant for web applications that integrate Tooltipy for tooltip generation, especially where user input is accepted and displayed without proper sanitization or encoding. This flaw highlights the importance of secure coding practices around input validation and output encoding to prevent injection attacks.

For European organizations, the impact of CVE-2025-62917 can be significant, especially for those relying on Tooltipy in customer-facing or internal web applications. Successful exploitation could lead to session hijacking, unauthorized data access, and manipulation of web content, undermining user trust and potentially violating data protection regulations such as GDPR. The confidentiality and integrity of user data could be compromised, leading to reputational damage and possible legal consequences. Since the vulnerability requires some level of user interaction and privileges, the risk is somewhat mitigated but still notable in environments where users have elevated permissions or where attackers can trick users into interacting with malicious content. The absence of availability impact means service disruption is unlikely, but the persistent nature of stored XSS can facilitate ongoing exploitation. European sectors with high web application usage, such as finance, e-commerce, and public services, are particularly at risk. Furthermore, the vulnerability could be leveraged in targeted phishing or social engineering campaigns within Europe.

To mitigate CVE-2025-62917, organizations should implement strict input validation and output encoding for all user-supplied data processed by Tooltipy. Specifically, employing context-aware encoding (e.g., HTML entity encoding) before rendering tooltips can prevent script execution. Web application firewalls (WAFs) configured to detect and block XSS payloads can provide an additional layer of defense. Organizations should monitor web application logs for unusual input patterns indicative of exploitation attempts. Until an official patch is released, consider disabling or restricting the use of Tooltipy in environments where untrusted input is accepted. Conduct thorough code reviews and security testing focused on injection vulnerabilities in Tooltipy integrations. Educate developers on secure coding practices related to XSS prevention. Finally, maintain an incident response plan to quickly address any detected exploitation attempts.