CVE-2025-23783 identifies a stored cross-site scripting (XSS) vulnerability in the carrotbits Greek Namedays Widget provided by Eortologio.Net, affecting all versions up to and including 20191113. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious scripts that are stored persistently within the widget's data. When other users load the affected web pages containing the widget, the malicious scripts execute in their browsers under the context of the vulnerable site. This can lead to theft of session cookies, user impersonation, defacement, or redirection to malicious sites. The vulnerability does not require authentication, increasing its exploitability, and no user interaction beyond visiting the compromised page is needed. Although no known exploits have been reported in the wild, the presence of stored XSS in a widely embedded widget poses a significant risk. The lack of a CVSS score indicates that the vulnerability is newly published and pending further analysis or patching. The widget is primarily used in Greek-language websites to display namedays, making it a niche but regionally important component. The vulnerability highlights the importance of proper input validation and output encoding in third-party web components.

The stored XSS vulnerability in the Greek Namedays Widget can have severe impacts on organizations that embed this widget on their websites. Attackers can exploit the flaw to execute arbitrary JavaScript in the browsers of site visitors, potentially leading to session hijacking, theft of sensitive user data, unauthorized actions on behalf of users, website defacement, or redirection to malicious sites. This undermines user trust and can result in reputational damage, legal liabilities, and compliance violations, especially in regions with strict data protection laws. Since the widget is embedded in multiple websites, the scope of impact can be broad within communities or sectors relying on Greek cultural content. The vulnerability can also be leveraged as a foothold for further attacks, including delivering malware or phishing campaigns. The absence of authentication requirements and the stored nature of the XSS increase the ease of exploitation and persistence of the attack. Organizations worldwide using this widget or similar third-party components face increased risk until remediation is applied.

To mitigate CVE-2025-23783, organizations should immediately audit their websites for the presence of the carrotbits Greek Namedays Widget and assess exposure. Since no official patch links are currently available, temporary mitigations include disabling or removing the widget until a secure version is released. Implement strict input validation and sanitization on all user-supplied data that the widget processes, ensuring that potentially malicious scripts are neutralized before storage or rendering. Apply context-aware output encoding (e.g., HTML entity encoding) when displaying user input within web pages to prevent script execution. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Monitor web traffic and logs for suspicious activities indicative of exploitation attempts. Once a vendor patch or update is released, promptly apply it and verify the fix. Additionally, educate web developers and administrators about secure coding practices and the risks of third-party widgets. Consider using security scanners to detect XSS vulnerabilities in web applications regularly.