CVE-2025-23596 identifies a reflected Cross-site Scripting (XSS) vulnerability in the grafeon Notifikácie.sk product, a notification service platform. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows malicious actors to inject executable scripts into web responses. When a victim accesses a specially crafted URL or interacts with manipulated input, the injected script executes within their browser context. This can lead to theft of session cookies, redirection to malicious sites, or execution of unauthorized actions under the victim's credentials. The affected versions include all releases up to and including 1.0, with no patches currently available. The vulnerability is reflected, meaning the malicious payload is part of the request and reflected in the response, requiring user interaction such as clicking a link. No authentication is required to exploit this flaw, increasing its accessibility to attackers. Although no known exploits have been reported in the wild, the vulnerability poses a significant risk to users and organizations relying on Notifikácie.sk for notifications. The lack of CVSS scoring necessitates an expert severity assessment based on impact and exploitability factors.

The primary impact of this vulnerability is on the confidentiality and integrity of user data. Attackers exploiting this reflected XSS flaw can hijack user sessions, steal sensitive information such as authentication tokens or personal data, and perform actions on behalf of users without their consent. This can lead to unauthorized access to user accounts, data breaches, and potential lateral movement within affected organizations. Additionally, the vulnerability can be leveraged for phishing attacks by redirecting users to malicious websites or displaying deceptive content. The availability impact is generally low but could be indirectly affected if attackers use the vulnerability to disrupt user trust or cause reputational damage. Organizations worldwide using Notifikácie.sk, especially those in sectors handling sensitive or personal data, face increased risk of compromise, data leakage, and regulatory non-compliance. The absence of a patch increases exposure duration, emphasizing the need for immediate mitigation.

To mitigate this vulnerability, organizations should implement strict input validation and output encoding on all user-supplied data before rendering it in web pages. Employing context-aware encoding libraries that correctly escape characters in HTML, JavaScript, and URL contexts is critical. Web application firewalls (WAFs) can provide temporary protection by detecting and blocking malicious payloads targeting this XSS flaw. Users should be educated to avoid clicking suspicious links, especially those received from untrusted sources. Monitoring web traffic for unusual patterns and employing Content Security Policy (CSP) headers can reduce the impact of successful script injections by restricting script execution sources. Organizations should track vendor updates closely and apply patches promptly once available. Additionally, conducting regular security assessments and penetration testing focused on input handling can help identify and remediate similar vulnerabilities proactively.