CVE-2025-62948 identifies a stored Cross-site Scripting (XSS) vulnerability in the Konstantin Pankratov Date counter software, 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 stored and later executed in the context of users’ browsers. Stored XSS is particularly dangerous because the malicious payload persists on the server and can affect multiple users without requiring repeated attacker interaction. The CVSS 3.1 score of 6.5 indicates a medium severity, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). Exploitation could allow attackers to steal session cookies, perform actions on behalf of users, or inject malicious content, potentially leading to further compromise. No known exploits are currently reported in the wild, but the vulnerability is publicly disclosed and should be addressed promptly. The lack of available patches at the time of disclosure necessitates interim mitigations. The vulnerability is relevant to any web application or service using the Date counter component, especially those exposed to untrusted users or the public internet.

For European organizations, this vulnerability poses a moderate risk primarily to web applications incorporating the Date counter product. Exploitation could lead to unauthorized access to user sessions, data leakage, and manipulation of web content, undermining user trust and potentially violating data protection regulations such as GDPR. Organizations in sectors with high web exposure—such as e-commerce, government portals, and online services—may face reputational damage and operational disruptions. The stored nature of the XSS increases the risk of widespread impact across multiple users. Additionally, exploitation could serve as a foothold for further attacks within the network. The medium severity suggests that while the vulnerability is not critical, it should not be ignored, especially in environments where sensitive data or critical services are involved.

1. Monitor for and apply official patches or updates from Konstantin Pankratov as soon as they become available. 2. Until patches are released, implement strict input validation on all user-supplied data to ensure that potentially malicious scripts are sanitized or rejected. 3. Employ robust output encoding/escaping techniques when rendering user input in web pages to prevent script execution. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security audits and penetration testing focusing on input handling and web application security. 6. Educate developers and administrators about secure coding practices related to input handling and XSS prevention. 7. Use web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting the Date counter component. 8. Limit privileges of users and services interacting with the vulnerable component to reduce the potential impact of exploitation.