CVE-2025-64539 is a DOM-based Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. This vulnerability arises from improper handling of user-controllable input within the Document Object Model (DOM), allowing an attacker to inject malicious JavaScript code that executes in the context of the victim's browser. The attack vector requires the victim to visit a specially crafted malicious web page, which then triggers the execution of the injected script. Successful exploitation can lead to arbitrary code execution within the victim's browser session, enabling attackers to hijack user sessions, steal sensitive information, or perform actions on behalf of the user. The vulnerability is rated critical with a CVSS v3.1 score of 9.3, reflecting its high impact on confidentiality and integrity, ease of exploitation (network attack vector, no privileges required), and the requirement for user interaction. The scope is considered changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. Although no public exploits have been reported yet, the severity and nature of the vulnerability make it a significant threat to organizations relying on AEM for content management and digital experience delivery. The lack of available patches at the time of reporting underscores the urgency for organizations to implement interim mitigations and monitor for updates from Adobe.

For European organizations, the impact of CVE-2025-64539 is substantial. Adobe Experience Manager is widely used by enterprises, government agencies, and large institutions for managing digital content and customer experiences. Exploitation of this vulnerability could lead to session hijacking, unauthorized access to sensitive data, and potential manipulation of web content, undermining user trust and compliance with data protection regulations such as GDPR. The confidentiality and integrity of user sessions and data are at high risk, potentially resulting in data breaches, reputational damage, and regulatory penalties. Since the vulnerability requires user interaction, phishing or social engineering campaigns could be leveraged to increase exploitation success. The absence of known exploits currently provides a window for proactive defense, but the critical severity demands immediate attention to prevent future attacks. Disruption to digital services and customer-facing platforms could also affect business continuity and operational reliability.

1. Monitor Adobe's official channels for the release of security patches addressing CVE-2025-64539 and apply them immediately upon availability. 2. Implement strict Content Security Policies (CSP) 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 within AEM to prevent injection of malicious scripts. 4. Employ web application firewalls (WAFs) with updated signatures to detect and block suspicious payloads targeting this vulnerability. 5. Educate employees and users about phishing and social engineering tactics that could be used to lure victims to malicious pages. 6. Review and harden browser security settings, including disabling unnecessary scripting capabilities where feasible. 7. Perform regular security assessments and penetration testing focused on web application vulnerabilities to identify and remediate similar issues proactively. 8. Segment and isolate critical AEM infrastructure to limit lateral movement in case of compromise. 9. Maintain comprehensive logging and monitoring to detect anomalous activities indicative of exploitation attempts.