CVE-2026-24621 identifies a DOM-based Cross-site Scripting (XSS) vulnerability in the Terms descriptions software developed by Vladimir Statsenko, affecting versions up to and including 3.4.9. The vulnerability stems from improper neutralization of input during the generation of web pages, specifically in the handling of terms descriptions, which allows untrusted user input to be executed as code within the victim's browser environment. This type of XSS is client-side and occurs when the web application uses data from the DOM without proper sanitization or encoding before inserting it into the page. Exploiting this vulnerability could allow an attacker to execute arbitrary JavaScript in the context of the victim's session, potentially leading to session hijacking, unauthorized actions, or redirection to malicious sites. Although no public exploits have been reported, the vulnerability is publicly disclosed and documented in the CVE database. The lack of a CVSS score indicates that the vulnerability is newly published and pending detailed scoring, but the nature of DOM-based XSS typically implies a significant risk. The vulnerability affects all versions up to 3.4.9, with no patch links currently available, suggesting that users should monitor for updates or apply manual mitigations. The vulnerability was reserved and published in January 2026 by Patchstack, indicating active tracking by security vendors.

For European organizations, the impact of this DOM-based XSS vulnerability can be substantial, particularly for those operating web applications that incorporate the vulnerable Terms descriptions component. Successful exploitation can compromise user confidentiality by stealing cookies or session tokens, leading to account takeover or unauthorized access. Integrity can be affected if attackers perform unauthorized actions on behalf of users, such as changing settings or submitting fraudulent transactions. Availability impact is generally limited in XSS cases but could occur if attackers use the vulnerability to inject disruptive scripts. The client-side nature of the attack means that end users are directly targeted, which can damage organizational reputation and trust. Sectors such as finance, e-commerce, and government services in Europe, which rely heavily on secure web interactions, may face increased risk. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits following public disclosure. The vulnerability's ease of exploitation without authentication and without user interaction beyond visiting a malicious link increases its threat level. Organizations failing to address this vulnerability may face regulatory scrutiny under GDPR if user data is compromised.

To mitigate CVE-2026-24621, European organizations should take a multi-layered approach: 1) Monitor for and promptly apply official patches or updates from Vladimir Statsenko once released. 2) Implement strict input validation and output encoding on all user-supplied data, especially in the Terms descriptions component, to prevent malicious scripts from being injected into the DOM. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4) Conduct thorough code reviews and security testing focusing on client-side DOM manipulation to identify and remediate similar vulnerabilities. 5) Educate developers on secure coding practices related to DOM-based XSS. 6) Use web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting this product. 7) Encourage users to avoid clicking on suspicious links and consider browser security features that mitigate XSS risks. 8) Maintain incident response readiness to quickly address any exploitation attempts. These measures collectively reduce the likelihood and impact of exploitation beyond generic advice.