CVE-2025-62948 identifies a stored Cross-site Scripting (XSS) vulnerability in the Konstantin Pankratov Date counter product, specifically in versions up to and including 2.0.3. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be injected and stored persistently within the application. When other users access the affected pages, the malicious payload executes in their browsers within the security context of the vulnerable site. This type of vulnerability can lead to a variety of attacks including session hijacking, theft of sensitive information such as cookies or credentials, and unauthorized actions performed on behalf of the victim user. The vulnerability does not require prior authentication to exploit, increasing its risk profile. Although no known exploits are currently reported in the wild, the presence of stored XSS in a web-facing application poses a significant threat. The Date counter product is typically used to display date-related counters on websites, which may be integrated into various web services or analytics platforms. The lack of a CVSS score limits precise severity quantification, but the nature of stored XSS vulnerabilities generally implies a high risk due to their persistence and potential impact on multiple users. The vulnerability was published on October 27, 2025, with no patch links currently available, indicating that mitigation efforts should focus on input validation, output encoding, and monitoring for suspicious activity until official fixes are released.

For European organizations, this vulnerability could compromise the confidentiality and integrity of user sessions and data, especially in environments where the Date counter is embedded in customer-facing or internal web applications. Attackers exploiting this flaw could execute arbitrary JavaScript in the context of the vulnerable site, potentially stealing session tokens, redirecting users to malicious sites, or performing unauthorized actions. This could lead to data breaches, reputational damage, and regulatory non-compliance under GDPR if personal data is exposed. The availability impact is generally low for XSS but could be leveraged in combination with other attacks to disrupt services. Sectors such as e-commerce, digital marketing, and public sector websites that rely on web analytics or counters may be particularly at risk. The lack of authentication requirement and the stored nature of the XSS increase the attack surface and potential impact, as any user visiting the compromised page could be affected.

1. Immediately audit all user input fields in the Date counter application and implement strict input validation to reject or sanitize potentially malicious input. 2. Apply context-appropriate output encoding (e.g., HTML entity encoding) before rendering user-supplied data on web pages to prevent script execution. 3. Monitor web application logs and user reports for signs of suspicious activity or unexpected script execution. 4. Isolate or sandbox the Date counter component within web pages to limit the impact of any potential XSS exploitation. 5. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the risk of XSS exploitation. 6. Stay updated with vendor advisories and apply official patches promptly once released. 7. Conduct regular security assessments and penetration testing focusing on input handling and output rendering. 8. Educate developers and administrators on secure coding practices related to input sanitization and output encoding. 9. Consider temporary removal or replacement of the Date counter widget if mitigation is not feasible until patches are available.