CVE-2025-64789 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. Stored XSS occurs when malicious input is permanently saved on the target server, such as in form fields, and later rendered in users' browsers without proper sanitization. In this case, a low-privileged attacker can inject arbitrary JavaScript code into vulnerable form fields within AEM. When legitimate users access pages containing these fields, the malicious script executes in their browsers, potentially allowing the attacker to hijack user sessions, steal sensitive information, or perform actions on behalf of the user. The vulnerability requires user interaction (visiting the affected page) and low privileges, making it accessible to a broad range of attackers. The CVSS 3.1 base score is 5.4, indicating medium severity, with vector metrics AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. This means the attack is network exploitable, requires low privileges and user interaction, affects confidentiality and integrity with a changed scope, but does not impact availability. No public exploits are currently known, and no patches have been linked yet, suggesting organizations should monitor Adobe advisories closely. The vulnerability falls under CWE-79, a common and well-understood web application security issue. Given AEM's widespread use in enterprise content management, exploitation could lead to significant data exposure and trust erosion.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Adobe Experience Manager for managing public-facing websites or intranet portals. Exploitation could lead to theft of user credentials, session cookies, or other sensitive data, enabling further compromise of user accounts or internal systems. It can also facilitate phishing attacks by injecting deceptive content into trusted sites. The integrity of web content can be undermined, damaging organizational reputation and user trust. While availability is not directly affected, the indirect consequences of data breaches or account takeovers can disrupt business operations. Organizations in sectors such as government, finance, healthcare, and e-commerce, which often use AEM, are particularly at risk. The medium severity rating reflects that while exploitation requires user interaction and low privileges, the potential for data leakage and unauthorized actions is non-trivial. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released or details become public.

1. Monitor Adobe security advisories closely and apply official patches or updates for Adobe Experience Manager as soon as they become available. 2. Implement strict input validation and sanitization on all form fields to prevent malicious script injection. 3. Employ robust output encoding techniques to ensure that any user-supplied data rendered in web pages is safely encoded to prevent script execution. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security audits and penetration testing focused on web application vulnerabilities, including XSS. 6. Educate users and administrators about the risks of clicking on suspicious links or interacting with untrusted content. 7. Use web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting AEM. 8. Limit privileges of users who can submit content to the system to reduce the attack surface. 9. Review and harden AEM configurations to minimize exposure of vulnerable components. 10. Implement logging and monitoring to detect anomalous activities that may indicate exploitation attempts.