CVE-2026-0521 is a reflected cross-site scripting (XSS) vulnerability classified under CWE-79, affecting the PDF export functionality of TYDAC AG's MAP+ solution, specifically verified in version 3.4.0. The vulnerability arises due to improper neutralization of user-supplied input during web page generation, allowing an attacker to inject malicious JavaScript code into a crafted URL. When a victim accesses this URL, the injected script executes within the victim's browser context, potentially compromising session tokens, cookies, or enabling unauthorized actions on behalf of the user. The attack vector is network-based (AV:N), requires no privileges (PR:N), and no authentication (AT:N), but does require user interaction (UI:A) such as clicking a malicious link. The vulnerability impacts confidentiality and integrity at a high level (VC:L, VI:H), but has low impact on availability. The CVSS 4.0 score of 5.6 reflects a medium severity level. No patches or known exploits are currently documented, but the risk remains significant due to the ease of exploitation and potential damage. The vulnerability underscores the need for proper input validation and output encoding in web applications, especially in functionalities like PDF export that may reflect user input. Given the unauthenticated nature of the attack and the ability to deliver malicious URLs via email or other communication channels, phishing campaigns could be an effective exploitation method.

For European organizations using TYDAC AG's MAP+ solution, this vulnerability poses a risk of unauthorized script execution in users' browsers, potentially leading to session hijacking, data theft, or unauthorized actions within the application. Since MAP+ is often used in industrial, infrastructure, or mapping contexts, exploitation could compromise sensitive operational data or control interfaces. The reflected XSS could facilitate targeted phishing attacks, increasing the likelihood of successful exploitation. Confidentiality and integrity of user sessions and data are at high risk, while availability impact is minimal. Organizations with remote or distributed users are particularly vulnerable due to the ease of delivering malicious URLs. The medium CVSS score suggests moderate urgency, but the potential for lateral movement or escalation within critical systems elevates the overall risk profile. Failure to address this vulnerability could lead to reputational damage, regulatory non-compliance under GDPR if personal data is compromised, and operational disruptions.

1. Apply patches or updates from TYDAC AG as soon as they become available to address the XSS vulnerability in MAP+. 2. Implement strict input validation and output encoding on all user-supplied data, especially in the PDF export functionality, to neutralize malicious scripts. 3. Restrict access to the PDF export feature to authenticated and authorized users only, reducing the attack surface. 4. Employ web application firewalls (WAFs) with rules to detect and block reflected XSS attack patterns targeting MAP+. 5. Conduct user awareness training focused on recognizing phishing attempts and suspicious URLs to reduce the risk of user interaction with malicious links. 6. Monitor logs and network traffic for unusual access patterns or repeated attempts to exploit the PDF export feature. 7. Use Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 8. Regularly review and test web application security controls, including penetration testing focused on input handling and output encoding. 9. Segment critical MAP+ deployments to limit potential lateral movement if exploitation occurs. 10. Coordinate with TYDAC AG support and security advisories for timely threat intelligence and mitigation guidance.