CVE-2025-64539 is a DOM-based Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. The vulnerability arises from improper handling of user-controllable data within the Document Object Model (DOM), allowing attackers to inject malicious JavaScript code that executes in the victim's browser context. This type of XSS does not rely on server-side injection but manipulates client-side scripts, making detection and prevention more challenging. Successful exploitation enables attackers to perform session hijacking, steal sensitive information, and potentially execute arbitrary code within the user's browser environment. The vulnerability has a CVSS 3.1 base score of 9.3, indicating critical severity with network attack vector, low attack complexity, no privileges required, but requiring user interaction (victim must visit a maliciously crafted page). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable scope, increasing risk. Although no exploits have been reported in the wild yet, the vulnerability's characteristics make it a prime target for attackers aiming to compromise web applications and user sessions. Adobe Experience Manager is widely used by enterprises for managing digital content and customer experiences, making this vulnerability particularly impactful. The lack of available patches at the time of reporting necessitates immediate mitigation through configuration changes and user awareness.

For European organizations, the impact of CVE-2025-64539 is significant due to the widespread use of Adobe Experience Manager in sectors such as government, finance, retail, and media. Exploitation can lead to session hijacking, unauthorized access to sensitive data, and potential manipulation of web content, undermining trust and compliance with data protection regulations like GDPR. The confidentiality and integrity of user data are at high risk, potentially resulting in data breaches and reputational damage. Availability is not directly impacted, but the indirect effects of compromised sessions and data leakage can disrupt business operations. Attackers exploiting this vulnerability could target employees or customers through phishing campaigns, increasing the likelihood of successful attacks. Given the critical nature of the vulnerability and the strategic importance of digital content platforms in Europe, organizations face increased risk of targeted attacks, espionage, or fraud. The absence of known exploits in the wild currently provides a window for proactive defense, but the threat landscape may evolve rapidly.

1. Immediately monitor Adobe's official channels for patches or security updates addressing CVE-2025-64539 and apply them as soon as they become available. 2. Implement strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the risk of XSS exploitation. 3. Conduct thorough input validation and sanitization on all user-controllable inputs, especially those reflected in the DOM, to prevent injection of malicious scripts. 4. Employ web application firewalls (WAFs) with updated rules to detect and block malicious payloads targeting this vulnerability. 5. Educate users and administrators about the risks of phishing and social engineering attacks that could lead to visiting malicious pages. 6. Restrict or monitor third-party scripts and plugins integrated with AEM to minimize attack surface. 7. Use browser security features such as HTTPOnly and Secure flags on cookies to protect session tokens from theft via XSS. 8. Conduct regular security assessments and penetration testing focused on client-side vulnerabilities within AEM deployments. 9. Limit the exposure of AEM instances to the public internet where possible, using VPNs or access controls to reduce attack vectors. 10. Maintain comprehensive logging and monitoring to detect suspicious activities indicative of exploitation attempts.