CVE-2025-62917 identifies a stored Cross-site Scripting (XSS) vulnerability in the Jamel.Z Tooltipy plugin, specifically versions up to 5.5.9. Tooltipy is a tooltip generator used to enhance web pages by displaying additional information on hover or focus. The vulnerability stems from improper neutralization of input during web page generation, meaning that user-supplied data is not adequately sanitized or encoded before being embedded into the HTML output. This flaw allows an attacker with at least low-level privileges (PR:L) to inject malicious JavaScript code that is stored persistently within the application and executed in the context of other users’ browsers when they view the affected pages. The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) indicates that the attack can be launched remotely over the network with low attack complexity, requires some user interaction, and involves a scope change (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes limited confidentiality and integrity loss, such as theft of session cookies or manipulation of displayed content, but does not affect system availability. No known exploits are currently in the wild, and no patches have been linked yet, indicating that the vulnerability is newly disclosed. The vulnerability is categorized as medium severity with a CVSS score of 5.4, reflecting moderate risk. Stored XSS vulnerabilities are particularly dangerous because the malicious payload is served to multiple users, increasing the attack surface and potential damage. Tooltipy’s usage in web applications that handle user-generated content or dynamic tooltips makes this vulnerability a concern for any organization relying on this plugin for enhanced user interfaces.

For European organizations, the impact of CVE-2025-62917 can be significant, especially for those operating public-facing websites or internal portals that utilize the Tooltipy plugin. Successful exploitation could lead to session hijacking, credential theft, or unauthorized actions performed on behalf of legitimate users, undermining user trust and potentially exposing sensitive information. The confidentiality and integrity of user data may be compromised, leading to privacy violations and regulatory non-compliance under GDPR. Although availability is not directly affected, the reputational damage and potential legal consequences from data breaches could be substantial. Organizations in sectors such as finance, healthcare, government, and e-commerce, where user data protection is critical, are at higher risk. Additionally, the scope change in the vulnerability means that attackers might leverage this flaw to escalate privileges or move laterally within affected systems, increasing the overall threat. The lack of currently known exploits provides a window for proactive mitigation, but the medium severity score indicates that the vulnerability should not be underestimated.

To mitigate CVE-2025-62917, European organizations should: 1) Monitor Jamel.Z’s official channels for patches or updates addressing this vulnerability and apply them promptly once available. 2) Implement strict input validation on all user-supplied data to ensure that potentially malicious scripts are not accepted or stored. 3) Employ comprehensive output encoding/escaping techniques when rendering user input in HTML contexts to prevent script execution. 4) Deploy Content Security Policies (CSP) that restrict the execution of inline scripts and limit sources of executable code, thereby reducing the impact of any injected scripts. 5) Conduct regular security audits and penetration testing focused on XSS vulnerabilities in web applications using Tooltipy. 6) Educate developers and administrators about secure coding practices related to input handling and output generation. 7) Where possible, isolate Tooltipy components or sandbox their execution environment to limit the scope of potential exploitation. 8) Monitor web traffic and logs for unusual activity that might indicate attempted exploitation of this vulnerability. These measures, combined, will reduce the risk of exploitation and limit the potential damage from stored XSS attacks.