CVE-2025-30983 is a medium-severity vulnerability classified under CWE-79, which pertains to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). Specifically, this vulnerability affects the 'Card flip image slideshow' product developed by gopiplus, up to version 1.5. The flaw is a DOM-based XSS, meaning that malicious scripts can be injected and executed within the Document Object Model (DOM) environment of a user's browser without proper sanitization of user-supplied input. This can occur when the application dynamically generates web page content based on untrusted input, allowing attackers to execute arbitrary JavaScript code in the context of the victim's browser session. The CVSS v3.1 score is 6.5 (medium), with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L, indicating that the attack can be launched remotely over the network with low attack complexity, requires low privileges, and user interaction is necessary. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes limited confidentiality, integrity, and availability loss, as the attacker could potentially steal session tokens, manipulate page content, or cause denial of service. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was publicly disclosed on July 4, 2025.

For European organizations, this DOM-based XSS vulnerability poses a significant risk, especially for those using the gopiplus Card flip image slideshow component in their web applications. Exploitation could lead to session hijacking, unauthorized actions performed on behalf of users, or distribution of malware via malicious scripts. This can compromise user data confidentiality and integrity, damage organizational reputation, and potentially lead to regulatory non-compliance under GDPR if personal data is exposed. The requirement for low privileges and user interaction means phishing or social engineering could be used to trigger the exploit. Organizations with customer-facing websites or intranet portals incorporating this slideshow feature are particularly vulnerable. The scope change indicates that the attack could impact other components or data beyond the slideshow itself, increasing the potential damage. Although no active exploits are known, the medium severity and ease of exploitation warrant proactive mitigation to prevent future attacks.

European organizations should immediately audit their web applications to identify any use of the gopiplus Card flip image slideshow component, especially versions up to 1.5. Until an official patch is released, implement strict input validation and output encoding on all user-supplied data that interacts with the slideshow feature to neutralize potentially malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Additionally, enable HTTP-only and Secure flags on cookies to protect session tokens from being accessed via JavaScript. Conduct security awareness training to educate users about the risks of clicking on suspicious links that could trigger the vulnerability. Monitor web traffic and logs for unusual activity indicative of exploitation attempts. Finally, maintain close communication with the vendor for updates and apply patches promptly once available.