CVE-2024-38030 is a vulnerability classified under CWE-200, indicating an exposure of sensitive information to unauthorized actors. It affects Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The issue is related to Windows Themes spoofing, where specially crafted theme files can trick the system into revealing sensitive information. The vulnerability requires no privileges (PR:N) but does require user interaction (UI:R), such as opening or applying a malicious theme file. The attack vector is network-based (AV:N), meaning an attacker can deliver the malicious theme remotely, for example via email or web download. The vulnerability does not affect system integrity or availability but has a high impact on confidentiality (C:H), allowing unauthorized disclosure of sensitive data. The scope is unchanged (S:U), meaning the impact is limited to the vulnerable component without affecting other system components. The vulnerability is rated with a CVSS 3.1 score of 6.5 (medium severity), reflecting moderate risk. No known exploits are currently reported in the wild, but the vulnerability is publicly disclosed and could be targeted by attackers. No official patch links are provided yet, but monitoring for updates from Microsoft is critical. The vulnerability is significant for environments where legacy Windows 10 1809 systems remain in use, especially in enterprise and critical infrastructure settings.

For European organizations, the primary impact of CVE-2024-38030 is unauthorized disclosure of sensitive information, which could include user data, system configuration details, or other confidential information accessible via the Windows Themes mechanism. This exposure could facilitate further targeted attacks, social engineering, or data breaches. Organizations relying on Windows 10 Version 1809, particularly those with legacy systems or delayed patch management, are vulnerable. The confidentiality breach could lead to regulatory compliance issues under GDPR, resulting in legal and financial penalties. Since the vulnerability requires user interaction, phishing or social engineering campaigns could be used to exploit it. The lack of impact on integrity and availability reduces the risk of system disruption but does not diminish the importance of protecting sensitive data. Critical sectors such as finance, healthcare, government, and manufacturing in Europe could face increased risk due to the sensitive nature of their data and the potential for espionage or competitive disadvantage.

1. Apply Microsoft patches immediately once they become available for Windows 10 Version 1809 to remediate the vulnerability. 2. Until patches are deployed, restrict the ability to open or apply Windows theme files from untrusted sources by implementing application whitelisting or group policy settings. 3. Educate users about the risks of opening unsolicited theme files or links, emphasizing caution with email attachments and downloads. 4. Employ endpoint detection and response (EDR) tools to monitor for suspicious activity related to theme file handling or unusual user interactions. 5. Use network security controls such as email filtering and web content filtering to block or flag potentially malicious theme files. 6. Inventory and prioritize upgrading or replacing legacy Windows 10 Version 1809 systems to supported versions with ongoing security updates. 7. Conduct regular security awareness training focused on social engineering and phishing tactics that could deliver malicious themes. 8. Monitor threat intelligence feeds and Microsoft advisories for updates on exploit availability and additional mitigation guidance.