CVE-2025-62917 identifies a stored cross-site scripting (XSS) vulnerability in the Jamel.Z Tooltipy plugin, a tool used to generate tooltips with keyword highlights on web pages. The vulnerability stems from improper neutralization of user-supplied input during the generation of web content, allowing malicious scripts to be embedded and persist within the tooltip content. When a victim accesses a page containing the malicious tooltip, the injected script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. The affected versions include all releases up to and including 5.5.9, with no specific version excluded. No CVSS score has been assigned yet, and no patches or known exploits are currently reported. The vulnerability does not require authentication or user interaction beyond visiting the affected page, increasing its risk profile. The lack of proper input sanitization indicates a failure in secure coding practices within the Tooltipy plugin's input handling mechanisms. This vulnerability is particularly concerning for websites that rely on Tooltipy to enhance user experience, as it can be exploited to compromise site visitors and potentially administrators if they interact with the malicious content. Organizations using Tooltipy should monitor for updates from the vendor and consider interim mitigations such as disabling the plugin or implementing web application firewall (WAF) rules to detect and block suspicious payloads.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of user data and the availability of web services. Attackers exploiting this stored XSS can execute arbitrary JavaScript in the context of affected websites, leading to session hijacking, theft of cookies or credentials, defacement, or redirection to malicious sites. This can damage organizational reputation, lead to regulatory non-compliance under GDPR due to data breaches, and cause financial losses. Public-facing websites, customer portals, and internal dashboards using Tooltipy are particularly vulnerable. The ease of exploitation without authentication increases the likelihood of attacks. Additionally, if administrative users access compromised pages, attackers could escalate privileges or manipulate backend systems. The impact extends to undermining user trust and potentially facilitating further attacks such as phishing or malware distribution. European sectors with high digital engagement, including finance, healthcare, and e-commerce, may face elevated risks if Tooltipy is integrated into their web infrastructure.

Immediate mitigation steps include disabling the Tooltipy plugin until a security patch is released by Jamel.Z. Organizations should monitor official vendor channels for updates and apply patches promptly once available. In the interim, implement strict input validation and output encoding on all user-supplied data that Tooltipy processes to prevent script injection. Deploy web application firewalls (WAFs) with rules tailored to detect and block common XSS payloads targeting Tooltipy. Conduct thorough code reviews and security testing on web applications using Tooltipy to identify and remediate similar input handling weaknesses. Educate developers and administrators on secure coding practices, emphasizing the importance of sanitizing inputs and encoding outputs. Additionally, implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Regularly audit web logs for suspicious activity indicative of exploitation attempts. Finally, consider alternative tooltip solutions with stronger security track records if immediate patching is not feasible.