CVE-2025-48207 is a high-severity vulnerability classified under CWE-425 (Direct Request or Forced Browsing) affecting the reint_downloadmanager extension for the TYPO3 content management system (CMS). This vulnerability exists in versions up to and including 5.0.0 of the extension. The core issue is an Insecure Direct Object Reference (IDOR), which allows an unauthenticated attacker to bypass access controls and directly request resources or files managed by the download manager extension. Because the vulnerability is exploitable remotely without any authentication or user interaction, an attacker can craft specific HTTP requests to access restricted files or data that should otherwise be protected. The CVSS v3.1 base score of 8.6 reflects the critical confidentiality impact (C:H), no integrity or availability impact, network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and scope change (S:C), indicating that the vulnerability can affect resources beyond the initially vulnerable component. TYPO3 is a widely used open-source CMS, especially in Europe, and the reint_downloadmanager extension is commonly used to manage downloadable content. The lack of patches or mitigations currently available increases the urgency for organizations to implement compensating controls. Although no known exploits are reported in the wild yet, the ease of exploitation and the potential for unauthorized data disclosure make this a significant threat to TYPO3 installations using this extension.

For European organizations relying on TYPO3 with the reint_downloadmanager extension, this vulnerability poses a substantial risk of unauthorized data exposure. Confidential files intended for restricted audiences could be accessed by malicious actors, potentially leading to leakage of sensitive business information, intellectual property, or personal data protected under GDPR. This could result in regulatory penalties, reputational damage, and loss of customer trust. Since the vulnerability does not affect integrity or availability, the primary concern is confidentiality breach. However, the scope change means attackers might access data beyond the extension itself, possibly impacting other parts of the CMS or integrated systems. Given TYPO3's popularity among government agencies, educational institutions, and enterprises in Europe, the threat could affect critical infrastructure and services. The lack of authentication or user interaction requirements lowers the barrier for exploitation, increasing the likelihood of automated scanning and attacks targeting vulnerable TYPO3 instances.

1. Immediate mitigation should include restricting access to the downloadmanager extension's resources via web server configuration, such as IP whitelisting or authentication enforcement at the server or application firewall level. 2. Implement strict access control checks within TYPO3 or through custom middleware to validate user permissions before serving downloadable content. 3. Monitor web server logs for suspicious direct requests targeting the downloadmanager endpoints to detect potential exploitation attempts. 4. Disable or uninstall the reint_downloadmanager extension if it is not essential to business operations until a vendor patch is released. 5. Engage with TYPO3 community or vendor channels for updates and patches addressing this vulnerability and apply them promptly once available. 6. Conduct a thorough audit of all downloadable content to classify sensitivity and ensure that no critical data is exposed via this or similar mechanisms. 7. Consider deploying a Web Application Firewall (WAF) with custom rules to block forced browsing attempts targeting the extension's URLs. 8. Educate development and operations teams about secure coding practices to prevent IDOR vulnerabilities in custom TYPO3 extensions or integrations.