CVE-2025-64563 is a DOM-based Cross-Site Scripting vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. DOM-based XSS occurs when client-side scripts write untrusted data to the Document Object Model without proper sanitization, allowing attackers to inject malicious JavaScript code that executes in the victim's browser context. In this case, a low-privileged attacker can craft malicious URLs or manipulate web pages that, when visited or interacted with by a user, trigger the execution of arbitrary scripts. This can lead to theft of cookies, session tokens, or other sensitive information, and potentially enable further attacks such as account takeover or phishing. The vulnerability requires user interaction, such as clicking a link or engaging with a compromised page element, and does not require elevated privileges beyond low-level access. The CVSS 3.1 score of 5.4 reflects a medium severity, with network attack vector, low attack complexity, low privileges required, and user interaction necessary. The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component, impacting confidentiality and integrity but not availability. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. Adobe Experience Manager is widely used by enterprises for managing digital content and websites, making this vulnerability significant for organizations relying on AEM for their web presence.

For European organizations, exploitation of this vulnerability could lead to unauthorized disclosure of sensitive information such as authentication tokens, personal data, or internal business information through session hijacking or data theft. This can undermine user trust, lead to regulatory non-compliance (e.g., GDPR violations), and cause reputational damage. Since AEM is often used for public-facing websites and intranet portals, successful exploitation could facilitate phishing campaigns or lateral movement within corporate networks. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in environments with high user traffic or where social engineering is feasible. The medium CVSS score indicates moderate risk, but the potential for chained attacks or targeted exploitation against high-value targets in sectors like finance, government, and critical infrastructure increases the threat level. Disruption of web services or defacement is less likely, but data confidentiality and integrity are at risk.

European organizations should implement the following specific mitigations: 1) Monitor Adobe's security advisories closely and plan for rapid deployment of patches once released. 2) Apply strict input validation and output encoding on all user-controllable inputs within AEM to prevent injection of malicious scripts. 3) Deploy robust Content Security Policies (CSP) to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 4) Conduct security awareness training to educate users about the risks of clicking on suspicious links or interacting with untrusted web content. 5) Use web application firewalls (WAFs) with custom rules to detect and block malicious payloads targeting AEM. 6) Regularly audit and review AEM configurations and custom code for insecure client-side scripting practices. 7) Employ browser security features such as SameSite cookies and HttpOnly flags to limit session token exposure. 8) Implement multi-factor authentication to reduce the impact of credential theft resulting from XSS exploitation. These measures combined will reduce the likelihood and impact of exploitation until official patches are available.